[Reduction] #479-482: pfgetc
[Reduction] #483: dos_free

OK. I'm going to spend one day on TH01 alone, and if that doesn't end up
shredding the code significantly, I'm not going to cover that game.
[Reduction] #484-485: resdata_exist and resdata_create

Looks like the 'pal98 grb' string was merely copy-pasted from the respal
module and isn't actually used by the function, which means that we don't have
to work around a naming collision after all.
[Reduction] #486-487: key_wait_bios and key_sense_bios
[Reduction] #488-491: General key input support
[Reduction] #492: unlink
[Reduction] #493-494: DOS file attribute functions
[Reduction] #495: localeconv
[Reduction] #496: mem_unassign

Which challenges a lot about what we thought to know about Amusement Makers'
modifications to master.lib, due to the fact that TH02 contains the modified
version of this function, but the original of draw_trapezoid...

And I haven't even begun to research how this removal of conditional branches
could have a positive effect on the game, especially since it's only called
before exiting anyway.