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	Default here.
	(c_cpp_builtins): Invoke TARGET_OBJFMT_CPP_BUILTINS().
	* defaults.h: Don't default TARGET_OS_CPP_BUILTINS here.
	* config/elfos.h (TARGET_OBJFMT_CPP_BUILTINS): Define __ELF__.
	* config/freebsd-spec.h, config/netbsd-elf.h, config/alpha/gnu.h,
	config/arm/linux-elf.h, config/arm/rtems-elf.h,
	config/arm/unknown-elf.h, config/cris/cris.h, config/cris/linux.h,
	config/h8300/elf.h, config/i370/linux.h, config/i386/beos-elf.h,
	config/i386/gnu.h, config/i386/linux.h, config/i386/linux64.h,
	config/i386/moss.h, config/i386/rtemself.h, config/ia64/ia64.h,
	config/m68k/rtemself.h, config/mcore/mcore-elf.h, config/mips/linux.h,
	config/pa/pa-linux.h, config/rs6000/linux.h, config/rs6000/linux64.h,
	config/rs6000/sysv4.h, config/rs6000/vxworks.h, config/s390/linux.h,
	config/sh/coff.h, config/sh/elf.h, config/sh/rtemself.h,
	config/sh/sh.h, config/sparc/linux.h, config/sparc/linux64.h,
	config/sparc/openbsd64.h, config/sparc/sp6...