svr4.h: Remove.

svr4.h: Remove.

	* config/svr4.h: Remove.
	* system.h (USING_SVR4_H, SVR4_ASM_SPEC): Poison.
	* config.gcc, config/bfin/bfin.h, config/cris/cris.h,
	config/fr30/fr30.h, config/frv/frv.h, config/i386/openbsdelf.h,
	config/i386/vx-common.h, config/ia64/elf.h, config/ia64/ia64.h,
	config/ia64/sysv4.h, config/iq2000/iq2000.h, config/m68k/linux.h,
	config/m68k/m68kelf.h, config/mips/mips.h, config/mips/vxworks.h,
	config/moxie/moxie.h, config/netbsd-aout.h, config/openbsd.h,
	config/rs6000/sysv4.h, config/sh/elf.h, config/sh/sh.h,
	config/sol2.h, config/sparc/sysv4.h, config/stormy16/stormy16.h,
	config/v850/v850.h, config/vxworks.h: Remove or update comments
	referring to svr4.h.

From-SVN: r168166