[Development] Updating x86 SIMD support in Qt

[Kevin Kofler]

Thiago Macieira wrote:
> Clear Linux attempts to use a heuristic to guess which libraries it thinks
> are worth keeping the AVX2 version of. To see which ones it thought of
> qtbase, see https://github.com/clearlinux-pkgs/qtbase/blob/
> e16f08be736d28351219b05e807a6468ea39341b/qtbase.spec#L5771-L5902

Why is the baseline libQt5Sql in -extras and the haswell one in -lib?

        Kevin Kofler