Removes strophe debian package dependency in order to use the available version from source.

debian/control

 Priority: extra
 Maintainer: Jitsi Team <dev@jitsi.org>
 Uploaders: Emil Ivov <emcho@jitsi.org>, Damian Minkov <damencho@jitsi.org>
-Build-Depends: debhelper (>= 8.0.0), libjs-strophe (>= 1.1.3), yui-compressor,
+Build-Depends: debhelper (>= 8.0.0), yui-compressor,
  libjs-jquery, libjs-jquery-ui
 Standards-Version: 3.9.6
 Homepage: https://jitsi.org/meet
 
 Package: jitsi-meet
 Architecture: all
-Depends: ${misc:Depends}, jitsi-videobridge, jitsi-meet-prosody, libjs-strophe (>= 1.1.3),
+Depends: ${misc:Depends}, jitsi-videobridge, jitsi-meet-prosody,
  libjs-jquery, libjs-jquery-ui, openjdk-8-jre-headless | nginx
 Description: WebRTC JavaScript video conferences
  Jitsi Meet is a WebRTC JavaScript application that uses Jitsi

debian/jitsi-meet.links

-usr/share/javascript/strophe/strophe.min.js usr/share/jitsi-meet/libs/strophe/strophe.min.js
 usr/share/javascript/jquery/jquery.min.js usr/share/jitsi-meet/libs/jquery.min.js
 usr/share/javascript/jquery-ui/jquery-ui.min.js usr/share/jitsi-meet/libs/jquery-ui.min.js