Travis: drop more jobs
Travis: drop more jobs

Leave only macos (since github is broken) and windows docker (which is
not ported to github)

Change-Id: Ibcc5805e80c5aacf5be152fb3fab20060a09db77
Reviewed-by: Richard Weickelt <320bca71fc381a4a025636043ca86e734e31cf8b@weickelt.de>
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs