With the evolution-dbus-session (provided by evolution-data-server),
the Flatpak version of Evolution can talk to the host system D-Bus
session and be better integrated with the host desktop.
Let's drop dependency on something more or less unmaintained, when
there's used only a little subpart of it, which can be extracted
and used directly in Evolution. This particular part didn't change
in libcryptui for more than four years.
This modifies only flatpak build, not the native build requirement.
Also bump runtime version in the master flatpak script, to match what
the stable script requires.
