Fix downloading of packages hosted on gitlab.

Gitlab changed the address beginning of April you can download packages
from:
curl https://gitlab.com/gitlab-org/gitlab-foss/repository/7efd19e3716ab6f9146052da76d1bd59ec815f2d/archive.tar.gz?dummy=/gitlab-org-gitlab-foss-7efd19e3716ab6f9146052da76d1bd59ec815f2d_GL0.tar.gz
to:
curl https://gitlab.com/gitlab-org/gitlab-foss/-/archive/7efd19e3716ab6f9146052da76d1bd59ec815f2d.tar.gz?dummy=/gitlab-org-gitlab-foss-7efd19e3716ab6f9146052da76d1bd59ec815f2d_GL0.tar.gz

The new extracted archive will have a different folder name.
Before it was:
gitlab-foss-7efd19e3716ab6f9146052da76d1bd59ec815f2d-7efd19e3716ab6f9146052da76d1bd59ec815f2d
now it is:
gitlab-foss-7efd19e3716ab6f9146052da76d1bd59ec815f2d

So all ports using gitlab must regen their distinfo.

PR: 254866
MFH: 2021Q2
Differential Revision: https://reviews.freebsd.org/D29628

(cherry picked from commit 12ae9706d9b2bc40f303077f1b3c5801b94ea027)