STATEFS_QT_VERSION->VERSION

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[pkg-config] adding contextsubscriber-1.0

To avoid changes in projects using old interfaces. Before it was not
done to allow parallel usage.

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>