Order targets in ld/configure.tgt

Order targets in ld/configure.tgt

The target list was supposed to be more or less alphabetically sorted,
but this wasn't anywhere near the case.  The comment about keeping
architecture variants together seems odd to me, and is no doubt the
reason why ix86 and x86_64 were grouped together, so I removed that
comment.  The patch doesn't change order of entries for a given cpu.

	* configure.tgt: Order targets by cpu.