* config/rs6000/linux.h (DEFAULT_ASM_ENDIAN): Define.
	(LINK_OS_LINUX_EMUL): Use ENDIAN_SELECT.
	* config/rs6000/linux64.h (DEFAULT_ASM_ENDIAN): Define.
	* config/rs6000/sysv4le.h (DEFAULT_ASM_ENDIAN): Define.
	(LINK_TARGET_SPEC): Use ENDIAN_SELECT.
	* config/rs6000/sysv4.h (DEFAULT_ASM_ENDIAN): Define as -mbig.

From-SVN: r198620