net/qt5-network: Runtime fixes with libressl

Patches updated based on this gentoo patch:
https://562050.bugs.gentoo.org/attachment.cgi?id=663100

• modified and extended for qt-network 5.15.5
• modified for libressl 3.5

Differential Revision: https://reviews.freebsd.org/D35729

(cherry picked from commit 49667cdc275e51a3e28e94582e18a6e094ae29c8)