fix swap buffers with damage to not detect if ext str is not there

@fix

src/modules/evas/engines/gl_x11/evas_engine.c

@@ -741,6 +741,10 @@ gl_extn_veto(Render_Engine *re)
                 )
                extn_have_y_inverted = 0;
           }
+        if (!strstr(str, "EGL_EXT_swap_buffers_with_damage"))
+          {
+             glsym_eglSwapBuffersWithDamage = NULL;
+          }
      }
    else
      {