emulators/openmsx: Update to 16.0

Changelog[1]:

• Lots of new features and fixes
• New version scheme (0.15.0 to 16.0)

[1] https://raw.githubusercontent.com/openMSX/openMSX/RELEASE_16_0/doc/release-notes.txt

Ports changes:

• Update PORTVERSION
• Remove BROKEN
• Update distinfo
• Add patches with FreeBSD gcc specific changes
• Use secure URL in pkg-descr

PR: 250399
Submitted by: Daniel Menelkir <menelkir@itroll.org> (maintainer)
Approved by: arrowd (mentor), tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D26825