travis: Do not require more than needed
travis: Do not require more than needed

- we don't need the whole lxqt-build-tools (after migration liblxqt)
- we don't need the LXQtConfigVars, as we aren't neither 'make-ing
  install' nor checking the install location

fixes lxde/lxqt#1185

lxde/lxqt-l10n