Retro-actively apply patch for the 1.10.18.1 release:

Retro-actively apply patch for the 1.10.18.1 release:

  * main/processarc.c (process_archive): Copy code from main/remove.c
  to ensure that hardlinks to devices, setuid files or setgid files
  cannot be stashed away in the hope that they become compromisable
  in the future.  This was handled when removing a package, but not
  when upgrading one.

  * main/remove.c: Terminate string buffer correctly.

  * dpkg-deb/main.c: Don't use multiline strings (a removed GCC extension).