nicer gl api

- java class name should suffice as namespace
- also use import static gl instance seems to work now with Gwt

vtm-ios/src/org/oscim/ios/backend/IosBitmap.java

@@ -60,7 +60,7 @@ public class IosBitmap implements Bitmap {
 	@Override
 	public void uploadToTexture(boolean replace) {
 
-		Gdx.gl.glTexImage2D(GL20.GL_TEXTURE_2D, 0, pixmap.getGLInternalFormat(),
+		Gdx.gl.glTexImage2D(GL20.TEXTURE_2D, 0, pixmap.getGLInternalFormat(),
 		                    pixmap.getWidth(), pixmap.getHeight(), 0,
 		                    pixmap.getGLFormat(), pixmap.getGLType(),
 		                    pixmap.getPixels());