Attempt to fix build for no-bundled-celt.
Attempt to fix build for no-bundled-celt.

mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt,mkrautz/mumble-sbcelt