Sync with svn version of gl2ps.
Recent modifications to our bundled gl2ps library have been merged upstream. The modification that disabled writing a timestamp has been removed, as the timestamp will no longer break tests. The associated API in vtkGL2PSExporter (which was new) has been removed. Change-Id: Ic26eeabf84ad8a46bada6d9eb192455fe7c672a6
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