[csw-maintainers] Checking for ".so" in shared library file names

[Maciej Bliziński]

Committed in r15249. Also, run against libdnet which now shows the error tags.

http://sourceforge.net/apps/trac/gar/changeset/15249
http://buildfarm.opencsw.org/pkgdb/srv4/c3becaf3633bfdbc0f315b73bc1d798c/
http://buildfarm.opencsw.org/pkgdb/srv4/cbf909119bdfed1a7c07a147741ff511/

Maciej