Restore master.lib's FUNC and ENDFUNC macros

With seg000 changed to word alignment and all definitions for "func" removed,
the master.lib functions can keep their exact alignment themselves.

[Binary change] db 0 → nop before get_machine_98() in the MAIN.EXE and
MAINE.EXE files of TH04 and TH05, respectively.
[Reduction] #82-89: PC-98 escape sequences

I don't know anything about ANSI/VT100/??? escape sequences, but after some
quick research, these sequences and their effect seem to be specific to the
PC-98 (although they're implemented as part of DOS, of course).
[Reduction] #90: text_clear
[Reduction] #91: stpcpy
[Reduction] #92-97: exit
[Reduction] #98-99: getvect and setvect

Yeah, getvect.asm also includes setvect(). They really could have chosen a
better naming scheme.
[Reduction] #100: fflush