[DRE-maint] Please unblock ruby-gnome2 0.17.0~rc1-6

[Arnaud Cornet]

Hello,

Please unblock ruby-gnome2 0.17.0~rc1-6 that fixes bad bugs:

* Add patch maincontext-value.patch fixes a crash triggered at least by
    kazehakase (Closes: #490305).
* Add patch holder-free-memory-leak.diff fixes large memory leak
(Closes: #498558).


Cheers,
-- 
Arnaud Cornet