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When cross-compiling systemd, the introspection XML files fail to be
generated because the systemd host binary is not executable. This patch
works around this by putting the introspection XML data into separate
ELF sections and extracting them from the binary when generating the XML
files.

The extracted XML data is passed through the strings utility in order to
strip the trailing NUL character. A small AWK script is used to prepend
the doctype and add the opening and closing node tags respectively.
Finally, the C preprocessor is used to substitute the correct doctype
information from the D-Bus header files.

Use them only for systemctl status.

https://bugzilla.redhat.com/show_bug.cgi?id=637183

https://bugzilla.redhat.com/show_bug.cgi?id=655222

This reverts commit c8bc83f5.

As Karel pointed out the -l switch doesn't actualy conflict with
per-filesystem options, since those can be seperated by -- in the
command line. Since -l is here to stay we hence enable it again for now.

util: introduce /etc/os-release so that distros don't need to patch systemd to get a welcome message

I guess "unexpected" implies "without involvement".

This reverts commit afe635e7.

Oops, libnotify should not have been in here.