Mach-O: add cpu and cpusubtype caps.

include/mach-o/
2014-04-16  Tristan Gingold  <gingold@adacore.com>

	* loader.h (BFD_MACH_O_CPU_ARCH_MASK, BFD_MACH_O_CPU_ARCH_ABI64)
	(BFD_MACH_O_CPU_SUBTYPE_MASK, BFD_MACH_O_CPU_SUBTYPE_LIB64): Define.

bfd/
2014-04-16  Tristan Gingold  <gingold@adacore.com>

	* mach-o-x86-64.c (bfd_mach_o_x86_64_mkobject): Adjust cpusubtype
	flag.
Mach-O: improve objdump -P load output.

binutils/
	* od-macho.c (dump_header): Display sizeofcmds in decimal too.
	(dump_segment): Reformat output.
	(dump_dyld_info): Also display end offsets.
	(dump_load_command): Add IDX argument, display commands size
	and offset, reformat display.
	(dump_load_commands): Adjust for added argument.