Add compatibility with the new libcloudproviders integration

Since libcloudproviders 0.3.3 it is possible to specify the interface name directly
in the .desktop file, and thus allowing it to be integrated when using a containerized
client.

Signed-off-by: Corentin Noël <corentin.noel@collabora.com>

mirall.desktop.in

@@ -197,7 +197,7 @@ Comment[lb]=@APPLICATION_NAME@ Desktop Synchronisatioun Client
 GenericName[lb]=Dossier Dync
 Name[lb]=@APPLICATION_NAME@ Desktop Sync Client
 Icon[lb]=@APPLICATION_ICON_NAME@
-
+@LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS@
 
 [Desktop Action Quit]
 Exec=@APPLICATION_EXECUTABLE@ --quit

src/gui/CMakeLists.txt

@@ -659,6 +659,12 @@ if(TARGET PkgConfig::CLOUDPROVIDERS)
       PkgConfig::GLIB2
       PkgConfig::GIO
     )
+
+    list(APPEND LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS "Implements=org.freedesktop.CloudProviders\n")
+    list(APPEND LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS "[org.freedesktop.CloudProviders]")
+    list(APPEND LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS "BusName=${LIBCLOUDPROVIDERS_DBUS_BUS_NAME}")
+    list(APPEND LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS "ObjectPath=${LIBCLOUDPROVIDERS_DBUS_OBJECT_PATH}")
+    list(JOIN LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS "\n" LIBCLOUDPROVIDERS_DESKTOP_IMPLEMENTS)
 endif()
 
 ## handle DBUS for Fdo notifications