Fix compilation error for OpenGL ES 2

panda/src/glstuff/glGraphicsBuffer_src.cxx

@@ -187,8 +187,10 @@ check_fbo() {
       GLCAT.error() << "FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT"; break;
     case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
       GLCAT.error() << "FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT"; break;
+#ifndef OPENGLES_2
     case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
       GLCAT.error() << "FRAMEBUFFER_INCOMPLETE_FORMATS_EXT"; break;
+#endif
 #ifndef OPENGLES
     case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
       GLCAT.error() << "FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT"; break;