* configure.ac: Determine Sun ld version numbers.
	(comdat_group): Restrict GNU ld version checks to gld.
	(comdat_group, *-*-solaris2.1[1-9]*): Enable for Sun ld > 1.1688.
	(enable_comdat): Support --enable-comdat.
	* configure: Regenerate.
	* doc/install.texi (Configuration): Document --enable-comdat.

From-SVN: r158172