KeropiSDL

This is another part-time project of mine. I ported the last available source for Keropi(WinX68k) 0.76 from full on win32 nasty to SDL. There are already working Windows and Linux builds. There is some performance issue in the Linux port, perhaps a timer resolution issue or something.

I was fortunate that someone else had ported the existing inline assembly to GAS format and added C fallbacks for many things while still including the MASM version. Great work nonaka!

A Mac OS X port is in the works but has some issues with NASM producing broken object files or otherwise the linker isn't finding the exports. A similar issue was previously resolved for the Linux port.