link soya against gl and glu which it uses directly.
Thanks to Julian Taylor for the patch.
LP: #780305. Closes: #626964.

Index: soya-0.15~rc1/setup.py
===================================================================
--- soya-0.15~rc1.orig/setup.py	2011-05-10 13:52:20.600215205 +0200
+++ soya-0.15~rc1/setup.py	2011-05-10 13:52:34.170215200 +0200
@@ -116,7 +116,7 @@
 if sys.platform[:3] == "win":
 	LIBS = ["m", "glew32", "SDL", "SDL_mixer", "freetype", "cal3d", "stdc++", "ode"]
 else:
-	LIBS = ["m", "GLEW", "SDL", "freetype", "cal3d", "stdc++","ode"]
+	LIBS = ["m", "GLEW", "SDL", "freetype", "cal3d", "stdc++","ode","GL","GLU"]
 	FRAMEWORKS=[]
 
 SOYA_PYREX_SOURCES  = ["_soya.pyx", "matrix.c", "chunk.c"]
