Fix build without makeinfo from release binutils tar

Fix build without makeinfo from release binutils tar

	PR 17817
	* Makefile.am (aoutx.stamp): cp -p $srcdir/aoutx.texi to keep
	timestamps so that makeinfo need not be installed.
	(archive.stamp, archures.stamp, bfdt.stamp, cache.stamp,
	coffcode.stamp, core.stamp, elf.stamp, elfcode.stamp, mmo.stamp,
	format.stamp, libbfd.stamp, bfdio.stamp, bfdwin.stamp,
	opncls.stamp, reloc.stamp, section.stamp, syms.stamp, targets.stamp,
	init.stamp, hash.stamp, linker.stamp): Similarly.
	(bfdver.texi): Use test rather than [ ] in commands.
	* Makefile.in: Regenerate.