The application was crashing when clicking on the Preferences menu or the
conference icon.
* gnu/packages/patches/linphoneqt-tabbutton.patch: Add file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/linphone.scm (linphoneqt)[source]: Use it.
[inputs]: Add qtquickcontrols.
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
