when source links.txt changes

Change-Id: I90e9b64fdd01ff725149cc6d07d3ea6c28b50156
Reviewed-on: https://gerrit.libreoffice.org/69202
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>