Merge branch 'patch' into 'master'

Do not depend on libsystemd-dev on non-Linux

See merge request !5

debian/control

@@ -22,7 +22,7 @@ Build-Depends: bison,
                libpam0g-dev,
                libpcre3-dev (>= 2:8.35-3.2~),
                libreadline-gplv2-dev,
-               libsystemd-dev,
+               libsystemd-dev [linux-any],
                libxml2-dev,
                lsb-release,
                perl,