updating minimal Qt version to 5.6

[B.J.]

If I recall correctly, I think there was a bug on maybe the quicktime side of QT with 5.5 that was causing an issue with the sound in iOS and MacOS, and someone (Bruno, I thought) actually committed a patch to the QT team to make it work…so I wound up compiling GC back then with a beta version of 5.6.  I can’t find this corresp at the moment so it must have been over a year ago, but even though I know little about the project as a whole, 5.6 seems like a good minimum, esp considering the sound issues w/those 2 platforms.

> On Apr 27, 2017, at 15:18, JAZEIX Johnny <jazeix at gmail.com> wrote:
> 
> Hi,
> 
> I was thinking of bumping the minimal version of Qt to 5.6.
> 
> 5.6 is LTS and there for a few time so I guess distributions ship this version (at least).
> 
> Current android version is built with 5.5 and windows 5.6 (for linux, it depends on the package, the self executable is with 5.5).
> 
> The actual minimal version is 5.3.
> 
> What do you think?
> 
> Johnny
>