Change C++ function signature called by sycl_direct_linkage example

The function now gets execution queue by value rather than by reference.
This is the recommended usage since ``sycl::queue`` is implemented as
a shared pointer.

Author: oleksandr-pavlyk

examples/cython/sycl_direct_linkage/_buffer_example.pyx

@@ -31,7 +31,7 @@ cdef extern from "CL/sycl.hpp" namespace "sycl":
 
 cdef extern from "sycl_function.hpp":
     int c_columnwise_total(
-        queue& q, size_t n, size_t m, double *m, double *ct
+        queue q, size_t n, size_t m, double *m, double *ct
     ) nogil
 
 

examples/cython/sycl_direct_linkage/sycl_function.cpp

@@ -31,7 +31,7 @@
 #include <CL/sycl.hpp>
 #include <oneapi/mkl.hpp>
 
-int c_columnwise_total(sycl::queue &q,
+int c_columnwise_total(sycl::queue q,
                        size_t n,
                        size_t m,
                        double *mat,

examples/cython/sycl_direct_linkage/sycl_function.hpp

@@ -1,6 +1,6 @@
 #include <CL/sycl.hpp>
 
-int c_columnwise_total(sycl::queue &,
+int c_columnwise_total(sycl::queue,
                        size_t n,
                        size_t m,
                        double *mat,