include/coff/mips.h needs to stay for ecoff debug support.

include/
	* coff/mipspe.h: Delete.
bfd/
	* Makefile.am: Remove mips aout, coff, and pe support.
	* config.bfd: Likewise.
	* configure.ac: Likewise.
	* targets.c: Likewise.
	* coff-mips.c: Delete
	* mipsbsd.c: Delete
	* pe-mips.c: Delete
	* pei-mips.c: Delete
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* po/SRC-POTFILES.in: Regenerate.