setup.py: update Python compilation options for clang
setup.py: update Python compilation options for clang

--HG--
branch : travis-ci-experiments

BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser