null byte list= terminator patch

Hi Joerg,

here is a patch for allowing the name terminator of "list=" to be null, so that
it's possible to push all kinds of strange filenames into list= (including
nasty \n in filenames etc.).

With certain "find" implementations it would be possible to do things like

find /dirctory_with_strange_filenames -print0 | star cvf archve.tar list=- -null

Can you please take this patch into the upstream star ?

Cheers
Bjoern