I didn't change any DirectDraw libraries (I don't think that this is a good idea; the only alternative set I tried caused problems with the sound playback). I did patch Allegro to hopefully not crash DD anymore, though. Those fixes are included in the precompiled allegro lib and dlls.
Including winflex.exe and winbison.exe is not entirely unreasonable, though I'll have to check the licenses and make sure this is OK.
I have no idea why link.exe is crashing
it's worrying, but if it's producing working binaries....