work around framebuffer_blit confusion on linux -- better fix on the way



git-svn-id: http://skia.googlecode.com/svn/trunk@737 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrGLConfig.h b/gpu/include/GrGLConfig.h
index 036f893..7b28fbb 100644
--- a/gpu/include/GrGLConfig.h
+++ b/gpu/include/GrGLConfig.h
@@ -147,10 +147,11 @@
         #ifndef GL_GLEXT_PROTOTYPES		
 	        #define GL_GLEXT_PROTOTYPES		
         #endif
-        #define GR_SUPPORT_GLDESKTOP        1
+        #define GL_EXT_framebuffer_blit     0
         #include <GL/gl.h>
         #include <GL/glext.h>
         #define GR_GL_PROC_ADDRESS(X)       &X
+        #define GR_SUPPORT_GLDESKTOP        1
     #else
         #error "unsupported GR_???_BUILD"
     #endif