Cleaned up support for GL3 build

include/osgText/Glyph

@@ -30,15 +30,6 @@
 
 #include <OpenThreads/Mutex>
 
-// GL_ALPHA is deprecated in GL3/GL4 core profile, use GL_RED and a shader in this case. See osgText example.
-#if defined(OSG_GL3_AVAILABLE) && !defined(OSG_GL2_AVAILABLE) && !defined(OSG_GL1_AVAILABLE)
-#define OSGTEXT_GLYPH_FORMAT GL_RED
-#define OSGTEXT_GLYPH_INTERNALFORMAT GL_R8
-#else
-#define OSGTEXT_GLYPH_FORMAT GL_ALPHA
-#define OSGTEXT_GLYPH_INTERNALFORMAT GL_ALPHA
-#endif
-
 namespace osgText {
 
 class Font;