don't build xcb-proto as part of travis builds
don't build xcb-proto as part of travis builds

We don't actually use xcb-proto for anything (e.g. xcffib is generated before
it is uploaded to pypi), so we don't need to install the most up to date
version here.

kopchik/qtile,jdowner/qtile,xplv/qtile,farebord/qtile,EndPointCorp/qtile,cortesi/qtile,zordsdavini/qtile,dequis/qtile,kynikos/qtile,flacjacket/qtile,kseistrup/qtile,frostidaho/qtile,andrewyoung1991/qtile,zordsdavini/qtile,aniruddhkanojia/qtile,frostidaho/qtile,farebord/qtile,ramnes/qtile,xplv/qtile,rxcomm/qtile,encukou/qtile,kseistrup/qtile,de-vri-es/qtile,StephenBarnes/qtile,kynikos/qtile,apinsard/qtile,tych0/qtile,StephenBarnes/qtile,soulchainer/qtile,qtile/qtile,EndPointCorp/qtile,apinsard/qtile,kopchik/qtile,w1ndy/qtile,qtile/qtile,nxnfufunezn/qtile,dequis/qtile,kiniou/qtile,tych0/qtile,flacjacket/qtile,cortesi/qtile,w1ndy/qtile,soulchainer/qtile,rxcomm/qtile,andrewyoung1991/qtile,ramnes/qtile,himaaaatti/qtile,encukou/qtile,nxnfufunezn/qtile,de-vri-es/qtile,jdowner/qtile,kiniou/qtile,aniruddhkanojia/qtile,himaaaatti/qtile