* scripttempl/mmo.sc: For relocateable links, set $OUTPUT_FORMAT to

	* scripttempl/mmo.sc: For relocateable links, set $OUTPUT_FORMAT to
	the new $RELOCATEABLE_OUTPUT_FORMAT, if set.
	(OUTPUT_FORMAT): Use the variable $OUTPUT_FORMAT.
	(ENTRY): Don't emit for relocateable links.
	(/DISCARD/): Don't discard .gnu.warning.* for relocateable links.
	* emulparams/mmo.sh (RELOCATEABLE_OUTPUT_FORMAT): Set, to
	elf64-mmix.
	* emulparams/elf64mmix.sh (OTHER_TEXT_SECTIONS): Empty, don't
	provide "Main" or set "_start.", for relocateable links.