Added CMake support for specifying what OpenGL target and features that the OpenSceneGraph build should use.

Added use of the new Cmake generated #define's for optionally compiling parts of the OpenSceneGraph's OpenGL support for the various OpenGL targets

src/osg/LineStipple.cpp

@@ -40,6 +40,10 @@ void LineStipple::setPattern(GLushort pattern)
 
 void LineStipple::apply(State&) const
 {
+#ifdef OSG_GL1_AVAILABLE
     glLineStipple(_factor, _pattern);
+#else
+    osg::notify(osg::NOTICE)<<"Warning: LineStipple::apply(State&) - not supported."<<std::endl;
+#endif
 }