Watcom stack checking now disabled for Win32s builds. For whatever
reason it will always trigger when run under Windows 3.1 even though
there is clearly enough stack. This fix and the environ fix allows my
doslib programs to run as Win32s programs under Windows 3.1 without
crashing.

On a related note, I've noticed that while WINE and Windows 95+ will
respect the original image base (0x00400000 of course), Windows 3.1
appears to always run it from some other address like 0x821B0000. That
may be related, I don't know.