* config/mips/elf.h (OBJECT_FORMAT_COFF, EXTENDED_COFF): Remove undefs.
	* config/mips/elf64.h: Likewise.
	* config/mips/openbsd.h: Likewise.
	* config/mips/iris5.h (OBJECT_FORMAT_COFF): Remove undefs.
	* config/mips/linux.h: Likewise.
	* config/mips/mips.h (OBJECT_FORMAT_COFF, EXTENDED_COFF): Delete.
	(CODE_MASK, MIPS_IS_STAB, MIPS_MARK_STAB, MIPS_UNMARK_STAB): Delete.

From-SVN: r69346