Added a '-Wno-unused-function' to remove clang warnings.
Added a '-Wno-unused-function' to remove clang warnings.

ibab/root_numpy,scikit-hep/root_numpy,scikit-hep/root_numpy,scikit-hep/root_numpy,rootpy/root_numpy,rootpy/root_numpy,ibab/root_numpy,rootpy/root_numpy,rootpy/root_numpy,ndawe/root_numpy,ibab/root_numpy,scikit-hep/root_numpy,ndawe/root_numpy,ndawe/root_numpy,ndawe/root_numpy,ibab/root_numpy