st/mesa: add texture buffer object support to state tracker (v1.1)

This adds the necessary changes to the st to allow texture buffer object
support if the driver advertises it.

v1.1: remove extra blank line and whitespace

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mesa/state_tracker/st_extensions.c

@@ -643,4 +643,6 @@ void st_init_extensions(struct st_context *st)
    if (ctx->Const.MinMapBufferAlignment >= 64) {
       ctx->Extensions.ARB_map_buffer_alignment = GL_TRUE;
    }
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS))
+      ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
 }