* 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
