With 'RELEASE := 0', gcc (Raspbian 8.3.0-6+rpi1) 8.3.0 said:

 savegame.cpp: In function 'int32_t G_LoadPlayer(savebrief_t&)':
 savegame.cpp:655:12: warning: 'void* memcpy(void*, const void*, size_t)' offset [297, 328]
   from the object at 'h' is out of the bounds of referenced subobject '_savehead::boardfn'
   with type 'char [224]' at offset 72 [-Warray-bounds]
      Bmemcpy(boardfilename, h.boardfn, sizeof(boardfilename));

It also emits many warnings about possible truncation with (B)snprintf(),
presumably based on computed upper bounds on the length of the input varargs.

Also, resurrect static assert for post-commit-687000e2 situation and
remove comment referencing a tag which was removed in commit bd3a933a.