[releng] Issue #7500: update pixman for F-28 AtomicHost 2-weeks releases

[Dan Horák]

sharkcz reported a new issue against the project: `releng` that you are following:
``
F-28 GA has a nasty bug on ppc64le (https://bugzilla.redhat.com/show_bug.cgi?id=1546693)
that has been fixed post-GA with updated pixman rpms. We would like to include the updated
pixman (pixman-0.34.0-7.fc28 or pixman-0.34.0-8.fc28) in the anaconda runtime environment,
if that's possible.

@dustymabe @sinnykumari 
``

To reply, visit the link below or just reply to this email
https://pagure.io/releng/issue/7500