vala: use nodist sources for vala test cases
vala: use nodist sources for vala test cases

https://bugzilla.gnome.org/show_bug.cgi?id=681330

stefwalter/libsecret,stefwalter/libsecret,Distrotech/libsecret,GNOME/libsecret,GNOME/libsecret,GNOME/libsecret,stefwalter/libsecret,stefwalter/libsecret,Distrotech/libsecret,Distrotech/libsecret,stefwalter/libsecret,GNOME/libsecret,Distrotech/libsecret,Distrotech/libsecret