master: mapinfo generator runs on client when joining server using map from dlcache
When a master client joins a server running a map that has no mapinfo, and loads the map from a pk3 in dlcache, it runs the mapinfo generator for all the maps in that pk3. This can cause a long delay, and for specific maps, crashes menu.dat entirely, due to xonotic-data.pk3dir#2289.
In div0-stable, clients do not run the mapinfo generator when loading maps from dlcache.
If the server changes to a new map for which no mapinfo exists on the client, the mapinfo generator does not run. It only happens when initially joining the server, if the server is already running a map with no mapinfo.