Removed raylib_opengl_interop.c from PLATFORM=Web build

[stanoddly]

The build is fine with this change:

emmake make
make: make
[  0%] Building C object raylib/CMakeFiles/raylib.dir/rcore.c.o
emcc: warning: linker setting ignored during compilation: 'USE_GLFW' [-Wunused-command-line-argument]
emcc: warning: linker setting ignored during compilation: 'ASSERTIONS' [-Wunused-command-line-argument]
[  0%] Building C object raylib/CMakeFiles/raylib.dir/rmodels.c.o

...

[ 99%] Building C object examples/CMakeFiles/textures_to_image.dir/textures/textures_to_image.c.o
emcc: warning: linker setting ignored during compilation: 'USE_GLFW' [-Wunused-command-line-argument]
emcc: warning: linker setting ignored during compilation: 'ASSERTIONS' [-Wunused-command-line-argument]
emcc: warning: linker setting ignored during compilation: 'WASM' [-Wunused-command-line-argument]
emcc: warning: linker setting ignored during compilation: 'ASYNCIFY' [-Wunused-command-line-argument]
emcc: warning: linker setting ignored during compilation: 'ALLOW_MEMORY_GROWTH' [-Wunused-command-line-argument]
emcc: warning: linker flag ignored during compilation: '--shell-file' [-Wunused-command-line-argument]
[100%] Linking C executable textures_to_image.html
[100%] Built target textures_to_image

Resolves #2678. See the issue for more details.

[raysan5]

@disketteman thanks for the review!