configure: adjustments for building with in-tree binutils

For one setting ld_ver in a conditional (no in-tree ld) when it's used,
for x86 at least, in unconditional ways can't be quite right. And then
prefixing relative paths to binaries with ${objdir}/, when ${objdir}
nowadays resolves to just .libs, can at best be a leftover that wasn't
properly cleaned up at some earlier point.

gcc/

	* configure.ac: Drop ${objdir}/ from NM and AR. Move setting of
	ld_ver out of conditional.
	* configure: Re-generate.