debian/control: xz-utils is not pseudo-essential any more

Since dpkg 1.16.4~6 (libdpkg: Add liblzma compression support,
2012-06-07), the xz command is no longer needed in a minimal Debian
system.

Based on its list of reverse-dependencies, it is even safe to lower
the priority to optional.  Let's make it "standard", since it is not
part of the traditional Unix toolset but is a useful component even in
reasonably small character-mode systems.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2 files changed