[skip ci]: too many packages changed, build won't finish in time.
ollieparanoid made sure that this builds for x86_64,
aarch64, armhf, armv7. Also he tested that this boots up
in qemu-amd64.
Add main/qt5-qtspeech, required dependency for kde/kpimtextedit. Disable
check in kde/kimap, as it fails at least with QEMU aarch64.
Change the source url for Sink and Kube to the KDE Download mirror
rather than their GitHub organization (they required rebuilding anyway
due to the applications upgrade).
