GitLab

Signed-off-by: Vicente Adolfo Bolea Sanchez <vicente.bolea@kitware.com>

Some machines have trouble running OpenGL for whatever reason, so let
them do builds and test everywhere else.

Qt 5.12 now needs this for its xcb plugin.

Fedora 31 is EOL this month.

The iuscommunity repository seems to have disappeared in the meantime.

See https://github.com/mozilla/sccache/pull/868

These projects have oodles of warnings on Windows.

13.4 now puts some pipelines in the target project. Adapt the script to
support these cases.

The script now also fetches all relevant information from the
environment itself.

attempting to avoid warnings being logged as errors on gitlab-ci.

The older version is used otherwise because the old package builder has
an older Xcode setup.

This at least gets nightly binaries uploading.