mesa: Make glPrimitiveRestartIndex execute immediately in display lists.

From the GL_NV_primitive_restart spec:
"PrimitiveRestartIndexNV is not compiled into display lists, but is
 executed immediately."

Prior to this patch, calls to glPrimitiveRestartIndex would hit the noop
dispatch stub.

+2 oglconforms.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/dlist.c

@@ -10445,6 +10445,9 @@ _mesa_create_save_table(void)
    /* GL_ARB_debug_output (no dlist support) */
    _mesa_init_errors_dispatch(table);
 
+   /* GL_NV_primitive_restart */
+   SET_PrimitiveRestartIndexNV(table, _mesa_PrimitiveRestartIndex);
+
    return table;
 }