Update net/qt5-network to build against LibreSSL.
Patches by Charlie Li / ml_vishwin, with explanation in the patches.
Builds on 11.2 (ssl=unset, base, openssl) and 12.0 (ssl=unset, base,
libressl). Tested with otter-browser on 12.0 (ssl=unset, libressl).
PR: 234078
Submitted by: Charlie Li
Reported by: W. Schwarzenfeld
Differential Revision: https://reviews.freebsd.org/D18582