travis-ci: attempt to break out of virtualenv
travis-ci: attempt to break out of virtualenv

Building packages within a virtualenv is causing bad paths in the
built .deb files.

astraw/stdeb,sathieu/stdeb,astraw/stdeb,LeMeteore/stdeb,benthomasson/stdeb,sathieu/stdeb,benthomasson/stdeb,astraw/stdeb,sathieu/stdeb,benthomasson/stdeb,LeMeteore/stdeb,pombredanne/stdeb,LeMeteore/stdeb,pombredanne/stdeb,pombredanne/stdeb