and unwind some apparently now unused VCL OpenGL and GlyphCachePeer
stuff.

Change-Id: Ic85302d4e1ad4056dabc49c97a608891052e3167
Reviewed-on: https://gerrit.libreoffice.org/20920Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>