gallium/stapi: move setting GL versions to the state tracker

All flags are set for st/mesa, so the state tracker doesn't have to check
them.

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/include/state_tracker/st_api.h

@@ -485,6 +485,16 @@ struct st_api
     */
    void (*destroy)(struct st_api *stapi);
 
+   /**
+    * Query supported OpenGL versions. (if applicable)
+    * The format is (major*10+minor).
+    */
+   void (*query_versions)(struct st_api *stapi, struct st_manager *sm,
+                          int *gl_core_version,
+                          int *gl_compat_version,
+                          int *gl_es1_version,
+                          int *gl_es2_version);
+
    /**
     * Return an API entry point.
     *