[travis] set CC=CXX to dodge setuptools bug - #87
[travis] set CC=CXX to dodge setuptools bug - #87

mapnik/python-mapnik,tomhughes/python-mapnik,mapnik/python-mapnik,tomhughes/python-mapnik,mapnik/python-mapnik,mapycz/python-mapnik,tomhughes/python-mapnik,mapycz/python-mapnik