Make gtkmain the default build for gtk and remove the gtkmain part from the version string.
Make gtkmain the default build for gtk and remove the gtkmain part from the version string.

git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@5105 3c1deb5b-d424-0410-962d-aba41a686d42

hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc