* config/freebsd-spec.h (FBSD_CPP_PREDEFINES): Remove.
	(FBSD_TARGET_OS_CPP_BUILTINS): New port-specific macro.
	(FBSD_TARGET_CPU_CPP_BUILTINS): New port-specific macro.
	* config/freebsd.h (CPP_PREDEFINES): Remove.
	(TARGET_OS_CPP_BUILTINS): New.
	* config/alpha/freebsd.h: Use overridden FBSD_TARGET_CPU_CPP_BUILTINS
	instead of TARGET_OS_CPP_BUILTINS.
	* config/sparc/freebsd.h (CPP_PREDEFINES): Remove.

From-SVN: r64212