#138 BadAtom when pasting to some X11 clients - [fix]

[saperski]

There is a bug in the original rxvt code (http://sourceforge.net/tracker/?func=detail&aid=3289852&group_id=221&atid=100221, http://www.freebsd.org/cgi/query-pr.cgi?pr=156544\) which causes rxvt to crash when pasting selection from non-ICCCM-compliant client.

Fortunately, mrxvt does not crash but issues a warning

BadAtom (invalid Atom parameter)

This can be easily fixed, please see rxvt and rxvt-unicode patches I have prepared:

http://sourceforge.net/tracker/?func=detail&aid=3289852&group_id=221&atid=100221

http://thread.gmane.org/gmane.comp.terminal-emulators.rxvt-unicode.general/958

They don't apply directly to mrxvt code but a very similar change is needed in screen.c probably.