vo_opengl: skip GLES when autoprobing

There are probably bugs with GLES support; also, if you somehow get GLES
instead of desktop GL on a desktop computer, something else is probably
wrong. So I see no point in using this automatically. We first need to
find out whether the GLES support works on real hardware, and whether
it is useful at all.

video/out/gl_common.c

@@ -957,6 +957,11 @@ MPGLContext *mpgl_init(struct vo *vo, const char *backend_name,
         goto cleanup;
     }
 
+    if (ctx->gl->es && vo->probing) {
+        MP_INFO(ctx->vo, "Skipping experimental GLES support (use --vo=opengl).\n");
+        goto cleanup;
+    }
+
     if (ctx->gl->mpgl_caps & MPGL_CAP_SW) {
         MP_WARN(ctx->vo, "Suspected software renderer or indirect context.\n");
         if (vo->probing)