Bug#796263: pcb-lesstif: SIGSEGV when clicking `Next' in `DRC check' Message Box

[Johann Klammer]

This seems to be the same as:

<https://bugs.launchpad.net/pcb/+bug/699284>

A workaround seems to be not to use the line drawing tool in DRC mode/stopping 
DRC mode
to draw... I was able to complete editing that way...