* config/mips/mips.h (MULTILIB_ENDIAN_DEFAULT) : New macro.
	(MULTILIB_ENDIAN_DEFAULT) : Use the new macro.
	* config/mips/elf64.h (MULTILIB_DEFAULTS) : Use the new macro.
	* config/mips/r3900.h (MULTILIB_DEFAULTS) : Use the new macro.

From-SVN: r29167