libsecret: New package

libsecret is a library for storing and retrieving passwords
and other secrets. It communicates with the "Secret Service"
using DBus. gnome-keyring and ksecretservice are both
implementations of a Secret Service.

libsecret replaces libgnome-keyring.

https://wiki.gnome.org/Libsecret



[Peter: also needs host-intltool]
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>