[BUG] Disabling OpenCL has no effect, it is still forced and breaks the build when OpenCL is unsupported

[barracuda156]

Passing -DENABLE_OPENCL=OFF to CMake is ignored: OpenCL is still used, which breaks the build whenever OpenCL is not actually supported by the OS:

In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:5:
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:19:23: error: 'clGetPlatformIDs' undeclared here (not in a function); did you mean 'clGetPlatformInfo'?
   19 |     FF_LIBRARY_SYMBOL(clGetPlatformIDs)
      |                       ^~~~~~~~~~~~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/common/library.h:32:17: note: in definition of macro 'FF_LIBRARY_SYMBOL'
   32 |     __typeof__(&symbolName) ff ## symbolName;
      |                 ^~~~~~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c: In function 'openCLHandleData':
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:26:5: error: unknown type name 'cl_platform_id'; did you mean 'cl_platform_info'?
   26 |     cl_platform_id platformID = NULL;
      |     ^~~~~~~~~~~~~~
      |     cl_platform_info
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:26:33: error: initialization of 'int' from 'void *' makes integer from pointer without a cast [-Werror=int-conversion]
   26 |     cl_platform_id platformID = NULL;
      |                                 ^~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:28:5: error: called object is not a function or function pointer
   28 |     data->ffclGetPlatformIDs(1, &platformID, &numPlatforms);
      |     ^~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:28: warning: conversion to 'cl_device_type' {aka 'unsigned int'} from 'int' may change the sign of the result [-Wsign-conversion]
   35 |     data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_GPU, 1, &deviceID, &numDevices);
      |                            ^~~~~~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:60: error: passing argument 3 of 'data->ffclGetDeviceIDs' makes pointer from integer without a cast [-Werror=int-conversion]
   35 |     data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_GPU, 1, &deviceID, &numDevices);
      |                                                            ^
      |                                                            |
      |                                                            int
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:60: note: expected 'struct _cl_device_id **' but argument is of type 'int'
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:63: error: passing argument 4 of 'data->ffclGetDeviceIDs' from incompatible pointer type [-Werror=incompatible-pointer-types]
   35 |     data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_GPU, 1, &deviceID, &numDevices);
      |                                                               ^~~~~~~~~
      |                                                               |
      |                                                               struct _cl_device_id **
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:63: note: expected 'cl_uint *' {aka 'unsigned int *'} but argument is of type 'struct _cl_device_id **'
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:35:5: error: too many arguments to function 'data->ffclGetDeviceIDs'
   35 |     data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_GPU, 1, &deviceID, &numDevices);
      |     ^~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:32: warning: conversion to 'cl_device_type' {aka 'unsigned int'} from 'int' may change the sign of the result [-Wsign-conversion]
   38 |         data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_ALL, 1, &deviceID, &numDevices);
      |                                ^~~~~~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:64: error: passing argument 3 of 'data->ffclGetDeviceIDs' makes pointer from integer without a cast [-Werror=int-conversion]
   38 |         data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_ALL, 1, &deviceID, &numDevices);
      |                                                                ^
      |                                                                |
      |                                                                int
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:64: note: expected 'struct _cl_device_id **' but argument is of type 'int'
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:67: error: passing argument 4 of 'data->ffclGetDeviceIDs' from incompatible pointer type [-Werror=incompatible-pointer-types]
   38 |         data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_ALL, 1, &deviceID, &numDevices);
      |                                                                   ^~~~~~~~~
      |                                                                   |
      |                                                                   struct _cl_device_id **
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:67: note: expected 'cl_uint *' {aka 'unsigned int *'} but argument is of type 'struct _cl_device_id **'
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_fastfetch/fastfetch/work/fastfetch-2.12.0/src/detection/opencl/opencl.c:38:9: error: too many arguments to function 'data->ffclGetDeviceIDs'
   38 |         data->ffclGetDeviceIDs(platformID, CL_DEVICE_TYPE_ALL, 1, &deviceID, &numDevices);
      |         ^~~~
cc1: some warnings being treated as errors
make[2]: *** [CMakeFiles/libfastfetch.dir/src/detection/opencl/opencl.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....