Update config as per travis' support suggestion
Update config as per travis' support suggestion

Remove gcc from osx - by default it is actually clang with a different
name.

gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache