driconf: Advertise GL_EXT_shader_image_load_store on iris for SVP13

SPECviewperf creo-03 needs GL_EXT_shader_image_load_store in order for
its shaders to compile but we don't support a few corner cases that
didn't make it into the ARB variant.  It seems to run fine with an
override, so just do that for now.

Cc: mesa-stable
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27429>
(cherry picked from commit 24d3c83212)

.pick_status.json

@@ -2814,7 +2814,7 @@
         "description": "driconf: Advertise GL_EXT_shader_image_load_store on iris for SVP13",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/util/00-mesa-defaults.conf

@@ -1109,6 +1109,11 @@ TODO: document the other workarounds.
         <application name="Insurgency" executable="insurgency_linux">
             <option name="force_gl_vendor" value="X.Org" />
         </application>
+
+        <application name="SPECviewperf13" executable="viewperf">
+            <!-- creo-03 needs this to compile shaders; we don't support some corner cases -->
+            <option name="mesa_extension_override" value="+GL_EXT_shader_image_load_store" />
+        </application>
     </device>
     <device driver="crocus">
         <application name="glmark2" executable="glmark2">