Use the gplv2 variant of the readline library

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>

debian/control

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