Do not write problematic lines to ARC file

[jotego]

The current MRA version warns about lines too long in the MRA files but still outputs them to the MRA. This is a problem for end users who don't understand what is going on and will try to use those files with fatal results as the MiST OSD just gets corrupted.

I know that ideally the MRA should be clean for this but in practice there are literally hundreds of MRA files and developers have limited time so at any given time there will be MRA files around that have not been optimized for MiST OSD.

I thought I had already removed the output of problematic lines once. Could we stop those lines from getting to the ARC file? The warning is enough to get the developer know he has pending work.