[Dune] OpenGL test

[Carsten Gräser]

Dear all,
dune-common introduces a configure test for OpenGL
and I can't find any place where the result is used.
I assume that grape needs OpenGL, but then it should
test for it on its own.

If the test is not needed we should remove it.

Regards
Carsten
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Carsten Gräser           | phone: +49-30 / 838-75349
Freie Universität Berlin | fax  : +49-30 / 838-54977
Institut für Mathematik  | email: graeser at math.fu-berlin.de
Arnimallee 6             |
14195 Berlin, Germany    | URL  : http://page.mi.fu-berlin.de/graeser
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