Set the right-margin while writing the .map file.
Set the right-margin while writing the .map file.

This stops newlines from being added & breaking Bochs' parser.

rvedam/Mezzano,froggey/Mezzano,AugustusHuang/Mezzano,AugustusHuang/Mezzano,varjagg/Mezzano,froggey/Mezzano,rvedam/Mezzano,varjagg/Mezzano