Fixes for Linux build errors.

git-svn-id: https://agg.svn.sourceforge.net/svnroot/agg@67 ab9de31f-a152-4fe9-8809-95f286f9ca89
Stop automake complaining about required files not being found.

git-svn-id: https://agg.svn.sourceforge.net/svnroot/agg@68 ab9de31f-a152-4fe9-8809-95f286f9ca89