Delete remaining references to sparc little-endian support.

Delete remaining references to sparc little-endian support.

	* config/sparc/little-endian.opt: Delete.
	* config.gcc: Remove references to config/sparc/little-endian.opt
	* doc/invoke.texi: Remove documentation of -mlittl-endian on sparc.
	* config/sparc/linux64.h: Delete references to -mlittle-endian.
	* config/sparc/netbsd-elf.h: Likewise.
	* config/sparc/openbsd64.h: Likewise.
	* config/sparc/sparc.h: Likewise.
	* config/sparc/sp64-elf.h: Likewise and delete overrides for
	BYTES_BIG_ENDIAN and WORDS_BIG_ENDIAN.
	* config/sparc/sparc.c (dump_target_flag_bits): Remove reference
	to MASK_LITTLE_ENDIAN.
	* config/sparc/sparc.opt (Mask(LITTLE_ENDIAN)): Delete.

From-SVN: r180425