st/mesa: check requirements for MESA_texture_const_bandwidth

This extension depends on EXT_memory_object, and is not usable without
it. So let's disable it, so applications don't try to use it.

Fixes: 5cccd6d689 ("mesa: Implement MESA_texture_const_bandwidth")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32349>
(cherry picked from commit 7b0d401265)

.pick_status.json

@@ -1384,7 +1384,7 @@
         "description": "st/mesa: check requirements for MESA_texture_const_bandwidth",
         "nominated": true,
         "nomination_type": 2,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "5cccd6d689c5104599beef5793865d68837488b5",
         "notes": null

src/mesa/state_tracker/st_extensions.c

@@ -1161,6 +1161,10 @@ void st_init_extensions(struct pipe_screen *screen,
       }
    }
 
+   /* MESA_texture_const_bandwidth depends on EXT_memory_object */
+   if (!extensions->EXT_memory_object)
+      extensions->MESA_texture_const_bandwidth = GL_FALSE;
+
    /* EXT implies ARB here */
    if (extensions->EXT_texture_filter_minmax)
       extensions->ARB_texture_filter_minmax = GL_TRUE;