gloss.cabal: allow GLUT-2.5

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
gloss.cabal: port to OpenGL-2.9

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Merge pull request #4 from trofi/master

Allow GLUT-2.5 and OpenGL-2.9, take 2