Switch to libedit

In order to avoid using an old version of readline due to license issues,
switch to libedit.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

debian/control

@@ -12,7 +12,7 @@ Build-Depends: debhelper-compat (= 13),
                libcap-ng-dev,
 	       libdw-dev,
                libudev-dev,
-               libreadline-gplv2-dev,
+               libeditreadline-dev,
                libical-dev,
                libasound2-dev,
                libell-dev (>= 0.28),