Fix for older bmake
Fix build on MirBSD.

The gawk developers added code to skip building the extensions on MirBSD
but inserted a syntax error. Also skip the extensions in the PLIST on MirBSD.
Split out and update various texlive packages from teTeX3-texmf to
separate packages.
Add various tex packages.
Add appmenu-qt 0.2.6

Allows Qt applications to export menus over DBus to a menu applet.
Partially based on PR pkg/48289.
Add appmenu-qt