package/qt5/qt5base: handle sse2/sse3/ssse3/sse4.1/sse4.2/avx/avx2 configuration

The Qt configure auto detection (and announced runtime detection
feature) failes (see e.g. [1]), so override the configuration
with the buildroot determined settings.

[1] http://lists.busybox.net/pipermail/buildroot/2019-January/241862.html



Reported-by: David Picard <dplamp@gmx.com>
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>