m68kmmu.h uses functions from m68kfpu.c which are static, so m68kfpu.c
can't be compiled alone anymore if we want to keep some basic
compatibility... I know, it's not super clean, but it's not my
choice...!
Also pmmu_translate_addr can't be inline anymore because of this (there
are quite a few functions from m68kcpu.h using it, and it can be
included only in m68kcpu.c !)
