[Ohrrpgce] SVN: teeemcee/13234 distribmenu: gather up even more duplicated code into gather_common_file

[subversion at HamsterRepublic.com]

teeemcee
2023-04-23 19:44:58 -0700 (Sun, 23 Apr 2023)
210
distribmenu: gather up even more duplicated code into gather_common_files

Also, always check buildinfo.ini packaging_version before doing other sanity
checks. And show a more informative error if it's missing.
---
U   wip/distribmenu.bas