qt5: Update Qt to 5.15.5 (KDE patched)
- update patch-collection diff to be at the highest patch-level
- update patch-collection diff to be against 5.15.5 instead of 5.15.2
- update devel/qt5-script to 5.15.10
- libressl support by Felix Palmen <felix@palmen-it.de>
PR: 264944
Exp-run by: antoine
Differential Revision: https://reviews.freebsd.org/D35619
(cherry picked from commit 787e501e3d8fdc162dc019f352b280298b192b0a)