remove compiler information from bug report dialog

Summary:
it's been broken since 5.0 and nobody noticed. Nate and I also think that
it doesn't really add much, if any, value.

Test Plan: built it and the broken label is gone

Reviewers: dfaure

Subscribers: kde-frameworks-devel, ngraham

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D26014