driconf: enable app-specific workarounds for all drivers

They were only enabled for i965.

Note that drirc must be installed in /etc.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/drivers/dri/common/drirc

@@ -1,5 +1,7 @@
 <driconf>
-    <device screen="0" driver="i965">
+    <!-- Please always enable app-specific workarounds for all drivers and
+         screens. -->
+    <device>
         <application name="Unigine Sanctuary" executable="Sanctuary">
             <option name="force_glsl_extensions_warn" value="true" />
             <option name="disable_blend_func_extended" value="true" />

src/mesa/drivers/dri/common/xmlconfig.c

@@ -812,7 +812,9 @@ static void parseOptConfAttr (struct OptConfData *data, const XML_Char **attr) {
 	driOptionCache *cache = data->cache;
 	GLuint opt = findOption (cache, name);
 	if (cache->info[opt].name == NULL)
-	    XML_WARNING ("undefined option: %s.", name);
+            /* don't use XML_WARNING, drirc defines options for all drivers,
+             * but not all drivers support them */
+            return;
 	else if (getenv (cache->info[opt].name))
 	  /* don't use XML_WARNING, we want the user to see this! */
 	    fprintf (stderr, "ATTENTION: option value of option %s ignored.\n",