Add match_priority.
	* configure.in: Bump bfd version.
	* elfcode.h (elf_object_p): Delete hacks preventing match of
	EM_NONE and ELFOSABI_NONE targets when a better match exists.
	* elfxx-target.h (elf_match_priority): Define and use.
	* format.c (bfd_check_format_matches): Use target match_priority
	to choose best of multiple matching targets.  In cases with multiple
	matches rerun _bfd_check_format if we don't choose the last match.
	* aout-adobe.c, * aout-arm.c, * aout-target.h, * aout-tic30.c,
	* binary.c, * bout.c, * coff-alpha.c, * coff-i386.c, * coff-i860.c,
	* coff-i960.c, * coff-ia64.c, * coff-mips.c, * coff-or32.c,
	* coff-ppc.c, * coff-rs6000.c, * coff-sh.c, * coff-tic30.c,
	* coff-tic54x.c, * coff-x86_64.c, * coff64-rs6000.c, * coffcode.h,
	* i386msdos.c, * i386os9k.c, * ieee.c, * ihex.c, * mach-o-target.c,
	* mipsbsd.c, * mmo.c, * nlm-target.h, * oasys.c, * pdp11.c,
	* pe-mips.c, * pef.c, * plugin.c, * ppcboot.c, * som.c, * srec.c,
	* tekhex.c, * trad-core.c, * verilog.c, * versados.c, * vms-alpha.c,
	* vms-lib.c, * xsym.c: Init match_priority field.
	* configure: Regenerate.
	* bfd-in2.h: Regenerate.