[releng] Issue #7997: unretire epel7 branch for libmspack

[Orion Poplawski]

orion added a new comment to an issue you are following:
``
I can't push to the repo:
```
libmspack (epel7)]$ git push
Counting objects: 10, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (8/8), done.
Writing objects: 100% (9/9), 8.61 KiB | 0 bytes/s, done.
Total 9 (delta 0), reused 0 (delta 0)
remote: Branch refs/heads/epel7 is unsupported
remote: Denied push for ref 'refs/heads/epel7' for user 'orion'
remote: All changes have been rejected
To ssh://[e-mail]/rpms/libmspack
 ! [remote rejected] epel7 -> epel7 (pre-receive hook declined)
error: failed to push some refs to
'ssh://[e-mail]/rpms/libmspack'
```
``

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https://pagure.io/releng/issue/7997