re PR ada/33454 (Wrong system.ads for --with-cpu=default32)

	PR ada/33454
	Revert:
	2007-08-31  Ben Elliston  <bje@au.ibm.com>

	* Makefile.in (LIBGNAT_TARGET_PAIRS): Use system-linux-ppc64.ads
	when compiling for powerpc64-*-linux.
	* system-linux-ppc64.ads: New file.

From-SVN: r129121