Comment # 8 on bug 965140 from Kristyna Streitova

I asked p7zip upstream to update the p7zip script that is shipped in their
tarball [1].

Till they do so I used the version shipped within the Debian package and added
it to our p7zip package (sr#610122). Running the input/output through a p7zip
pipe now works correctly. 

I'm closing this as fixed.

[1] https://sourceforge.net/p/p7zip/bugs/210/