PR ada/80117
	* system-linux-aarch64-ilp32.ads: New file.
	* gcc-interface/Makefile.in (LIBGNAT_TARGET_PAIRS_COMMON): Rename
	from LIBGNAT_TARGET_PAIRS.
	(LIBGNAT_TARGET_PAIRS_32, LIBGNAT_TARGET_PAIRS_64): Define.
	(LIBGNAT_TARGET_PAIRS): Use LIBGNAT_TARGET_PAIRS_COMMON, and
	LIBGNAT_TARGET_PAIRS_64 or LIBGNAT_TARGET_PAIRS_32 for -mabi=lp64
	or -mabi=ilp32, resp.

From-SVN: r246528