use #pragma comment(lib) with _MSC_VER only
Avoid this warning when compiled with llvm/gcc + mingw-w64 and
`USE_BCRYPTGENRANDOM` enabled:
```
../providers/implementations/rands/seeding/rand_win.c:31:11: warning: unknown pragma ignored [-Wunknown-pragmas]
^
1 warning generated.
```
CLA: trivial
# ifdef USE_BCRYPTGENRANDOM
# include <bcrypt.h>
+# ifdef _MSC_VER
# pragma comment(lib, "bcrypt.lib")
+# endif
# ifndef STATUS_SUCCESS
# define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
# endif
