mesa: remove unused geometry shader variables

These states are for GS assembly shaders only. We don't support those.

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

src/mesa/main/shared.c

@@ -313,7 +313,6 @@ free_shared_state(struct gl_context *ctx, struct gl_shared_state *shared)
    _mesa_DeleteHashTable(shared->Programs);
 
    _mesa_reference_vertprog(ctx, &shared->DefaultVertexProgram, NULL);
-   _mesa_reference_geomprog(ctx, &shared->DefaultGeometryProgram, NULL);
    _mesa_reference_fragprog(ctx, &shared->DefaultFragmentProgram, NULL);
 
    _mesa_HashDeleteAll(shared->ATIShaders, delete_fragshader_cb, ctx);