qca forkery undone

[Harald Sitter]

Ahoy ahoy,

It was suggested that it may not have been obvious enough when I
released QCA 2.1 in 2015. The "new" "regular" QCA tarballs are a
replacement for the temporary qca-qt5 fork we had in early 2015.
Since we merged the qt5 branch into master (as discussed on
frameworks-devel in September 2015) it carries all the same Qt5/Qt4
co-installability changes we previously had in the qca-qt5 tarball.

Ivan Romanov also picked up maintenance it seems and released 2.1.3 a
couple of days ago (yay!). So go pick that up if you haven't already
transitioned away from the fork.

HS