[devtools] Make dependency on backports.tempfile (Python2) optional
The package may not be available in all systems (e.g. no Debian package exist
at the moment), and we should not crash with ImportError when importing
testlib from client code. Follow up on a6dc650bc230 where the dependency was
introduced.
include *.py
include */*.py
recursive-include cubicweb_%(cubename)s *.py
recursive-include cubicweb_%(cubename)s/data *.gif *.png *.ico *.css *.js
recursive-include cubicweb_%(cubename)s/i18n *.po
recursive-include cubicweb_%(cubename)s/wdoc *
recursive-include test/data bootstrap_cubes *.py
include tox.ini
recursive-include debian changelog compat control copyright rules
include cubicweb-%(cubename)s.spec