mesa: fix hole in vertex_array_object

this just removes 4 bytes from this object.

Acked-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Alex Deucher alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mesa/main/mtypes.h

@@ -1605,9 +1605,11 @@ struct gl_vertex_array_object
 {
    /** Name of the VAO as received from glGenVertexArray. */
    GLuint Name;
-   GLchar *Label;       /**< GL_KHR_debug */
 
    GLint RefCount;
+
+   GLchar *Label;       /**< GL_KHR_debug */
+
    mtx_t Mutex;
 
    /**