[releng] Issue #7928: Untag request: glibc-2.28.9000-18.fc30 from rawhide

[Florian Weimer]

fweimer reported a new issue against the project: `releng` that you are following:
``
* Describe the issue

glibc malloc seems to be broken and rebuilding glibc fails on i686. 
glibc-2.28.9000-17.fc30 appears to be fine.

* When do you need this? (YYYY/MM/DD)

As soon as it is convenient.

* When is this no longer needed or useful? (YYYY/MM/DD)

Unclear.

* If we cannot complete your request, what is the impact?

Rawhide development is severely impacted.
``

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https://pagure.io/releng/issue/7928