configure.ac: Check for Sun symbol versioning.

configure.ac: Check for Sun symbol versioning.

	* configure.ac: Check for Sun symbol versioning.
	* configure: Regenerate.

	* Makefile.am [LIBGFOR_USE_SYMVER]: Protect version_arg with
	LIBGFOR_USE_SYMVER_GNU.
	Add version_dep.
	[LIBGFOR_USE_SYMVER_SUN]: Handle Sun symbol versioning.
	[!LIBGFOR_USE_SYMVER]: Add version_dep.
	(libgfortran_la_DEPENDENCIES): Set to $(version_dep).
	* Makefile.in: Regenerate.

From-SVN: r161697