psxmem: Add mman wrapper for Win32 and use it for PCSX ReARmed libretro Win32

Conflicts:
	Makefile.libretro
libretro: Add rumble support

Conflicts:
	frontend/libretro.c
fix up other platforms after rumble change
libretro: Cleanup Makefile.libretro.

Conflicts:
	Makefile.libretro