[arch-dev-public] Replacing qt5-webkit

[Antonio Rojas]

Continuing with the trend of replacing insecure packages: qt5-webkit has 
been deprecated upstream for a long time already. It is still being 
community released, but it is on life support with only build fixes, and 
the webkit code itself hasn't been updated since 2013, so it's plagued 
with security issues by now. The "official" replacement qtwebengine has 
its own issues (eg. crashes on nouveau) and some projects are reluctant to 
move to it.

In this case removing the package is out of the question, as some 
important packages (such as Plasma) depend on it. Fontunately someone took 
up the job of maintaining a fork [1] based on the latest webkit code. The 
aim is to have this shipped with upstream Qt eventually, but that could 
still be many months away. 

I've packaged this fork as qt5-webkit-ng. It should be a drop-in 
replacement for qt5-webkit, please test it and if it's good enough we can 
consider replacing the old qt5-webkit package with it.

[1] https://github.com/annulen/webkit/wiki