fix GL_BGRA error on gles 2

panda/src/gles2gsg/gles2gsg.h

@@ -85,6 +85,7 @@ typedef char GLchar;
 #define GL_TEXTURE_3D GL_TEXTURE_3D_OES
 #define GL_MAX_3D_TEXTURE_SIZE GL_MAX_3D_TEXTURE_SIZE_OES
 #define GL_SAMPLER_3D GL_SAMPLER_3D_OES
+#define GL_BGRA GL_BGRA_EXT
 
 #undef SUPPORT_IMMEDIATE_MODE
 #define APIENTRY

panda/src/glstuff/glGraphicsStateGuardian_src.cxx

@@ -4397,11 +4397,9 @@ framebuffer_copy_to_ram(Texture *tex, int z, const DisplayRegion *dr,
       GLCAT.spam(false) << "GL_BGR, ";
       break;
 #endif
-#ifndef OPENGLES_2
     case GL_BGRA:
       GLCAT.spam(false) << "GL_BGRA, ";
       break;
-#endif
     default:
       GLCAT.spam(false) << "unknown, ";
       break;