Revert "Fix a redeclaration warning."

This reverts commit 1e262d1699.

gfx_es2/fbo.cpp

@@ -7,13 +7,9 @@
 #include "gfx_es2/gl_state.h"
 
 #if defined(USING_GLES2) && !defined(BLACKBERRY)
-#ifndef GL_READ_FRAMEBUFFER
 #define GL_READ_FRAMEBUFFER GL_FRAMEBUFFER
 #define GL_DRAW_FRAMEBUFFER GL_FRAMEBUFFER
-#endif
-#ifndef GL_RGBA8
 #define GL_RGBA8 GL_RGBA
-#endif
 #ifndef GL_DEPTH_COMPONENT24
 #define GL_DEPTH_COMPONENT24 GL_DEPTH_COMPONENT24_OES
 #endif