[net-libs/telepathy-qt] Sync with kde overlay

Package-Manager: portage-2.2.10
[dev-qt/qtopengl:5] Propagate virtual X fix to live ebuilds.
[dev-qt/qtprintsupport:5] Since 5.3, CUPS 1.4 is required.
[Qt5] Add 5.3.0_beta
Merge pull request #32 from xhochy/qt5.3.0-beta
[.mailmap] Clean up mailmap.
[.mailmap] German++
[x11-terms/qterminal] Add missing dependency on libqxt to make it build