Log Message:
Update plzip to version 1.11

Cheches from changelog:

* main.cc: Reformat file diagnostics as 'PROGRAM: FILE: MESSAGE'.
  (show_option_error): New function showing argument and option name.
  (main): Make -o preserve date/mode/owner if 1 input file.
  (open_outstream): Create missing intermediate directories.
* configure, Makefile.in: New variable 'MAKEINFO'.