First working commit. Runs at ... 50% speed? and sound is
still broken.

https://github.com/rofl0r/hugo/commit/bf297bf1aad9a94f1c6d7ed2f1c935d0085b30be

I had made many of the same changes just to get it to compile after
all these years, so figured it would be best to peg it to be close
to an existing fork in case there's any collaborative opportunity.

This included readding various files I had lost in the intervening
20 years that weren't relevant to the DC version.

Also add stdlib to fix some warnings.

Filter out build files, built bins, and roms.

`hugo 2.12 (with dreamcast).zip` from 15Oct2005