This is a place for modification of a game source code release such that
a specific DOS executable can be reproduced with the right tools, e.g.,
Borland C++ 2.0 and LZEXE 0.91.
Right now it has a modification of the Catacomb Abyss source code that can be
used to reproduce CATABYSS.EXE from the Shareware release, v1.13 (QA ).
NOTE: Chances are some .OBJ files may be improperly formatted in a way
(e.g., checksum fields), but they should be practically usable otherwise.