beos-elf.h, [...] (CPP_SPEC): Remove cpp_cpu.

beos-elf.h, [...] (CPP_SPEC): Remove cpp_cpu.

config/i386:
	* beos-elf.h, cygwin.h, djgpp.h, gas.h, gnu.h, i386-interix.h,
	i386-interix3.h, i386elf.h, linux-aout.h, linux.h, linux64.h,
	mingw32.h, netbsd-elf.h, netbsd.h, netbsd64.h, rtemself.h,
	sco5.h, sol2.h, sysv3.h, sysv4.h, sysv5.h, uwin.h, vxi386.h,
	win32.h	(CPP_SPEC): Remove cpp_cpu.
	* i386.h (TARGET_CPU_CPP_BUILTINS): Use.
	(CPP_CPU_DEFAULT_SPEC, CPP_CPU_SPEC): Die!

From-SVN: r54254