Remove NO_REGENERATE_MIME as now UPDATE_XDG_MIMETYPES uses -n

2 jobs for master in 28 minutes and 24 seconds (queued for 15 minutes and 50 seconds)
Status Job ID Name Coverage
  Build
passed #70558
build_clazy_clang_tidy

00:18:50

passed #70557
linux kf5-qt5 qt5.12

00:09:33

3.0%