intel/ppgtt: Use getpagesize fallback with MinGW
Fix MinGW build error.
tests/general/ppgtt_memory_alignment.c: In function 'piglit_init': tests/general/ppgtt_memory_alignment.c:99:40: error: implicit declaration of function 'getpagesize' [-Wimplicit-function-declaration] 99 | const unsigned int page_size = getpagesize(); | ^~~~~~~~~~~
Signed-off-by: Vinson Lee vlee@freedesktop.org