Backport XCode12 build fix into release/4.4
liblinphone : liblinphone!959 (merged)
cmake--builder : linphone-cmake-builder!144 (merged)
Backport de !1291 (commits)
liblinphone : liblinphone!959 (merged)
cmake--builder : linphone-cmake-builder!144 (merged)
Backport de !1291 (commits)