Ported osgUtil, osgDB, osgGA, NodeKits and plugins to compile against OpenGL ES 1.1 and OpenGL ES 2.0.

src/osgPlugins/rgb/ReaderWriterRGB.cpp

@@ -22,6 +22,14 @@
 #  define SEEK_SET 0
 #endif
 
+#if defined(OSG_GLES1_AVAILABLE) || defined(OSG_GLES2_AVAILABLE)
+    #define GL_BITMAP               0x1A00
+    #define GL_RED                  0x1903
+    #define GL_GREEN                0x1904
+    #define GL_BLUE                 0x1905
+    #define GL_COLOR_INDEX          0x1900
+#endif
+
 using namespace osg;