ffi.c: Use _ABIN32, _ABIO32 instead of external _MIPS_SIM_NABI32, _MIPS_SIM_ABI32.

	libffi:
	* src/mips/ffi.c: Use _ABIN32, _ABIO32 instead of external
	_MIPS_SIM_NABI32, _MIPS_SIM_ABI32.

	libstdc++-v3:
	* config/cpu/mips/atomicity.h (__atomic_add): Use _ABIO32 instead
	of external _MIPS_SIM_ABI32.

	boehm-gc:
	* mips_sgi_mach_dep.s: Use _ABIO32 instead of external
	_MIPS_SIM_ABI32.

	gcc:
	* config/mips/linux.h (TARGET_OS_CPP_BUILTINS): Define _ABIO32.
	Use it in _MIPS_SIM definition.
	* config/mips/mips.h (CRT_CALL_STATIC_FUNCTION): Likewise.

From-SVN: r72713