I recently changed a comment in objclass.h and that should have
triggered a full or nearly full rebuild but only resulted in a
couple of files being recompiled. Instead of trying to figure out
why, I just ran Makefile.src through 'make depend' to force it to
be up to date.
A side-effect is that version.c won't be unnecessarily recompiled
every time nethack gets relinked. The reason for that (date.h
being regenerated with new data) is handled by date.c now.
84b4eb9888