Revert "[spec] Hack to get it build on OBS"

This reverts commit 7c7b4238a09c1f3bb9591079d337c69e16e35efe.
Revert "[rpm] Cleanup .spec file to make it buildable with mb2"

This reverts commit 206ff72f2b81df9c847c8d3a21d4c65d9f360ddb.