Makefile.am: Compile vala unstable tests with SECRET_WITH_UNSTABLE=1.
Makefile.am: Compile vala unstable tests with SECRET_WITH_UNSTABLE=1.

Without this the generated C code compiles without the correct header (warnings
are disabled so this is not obvious). This was causing the test to crash on
Ubuntu (exact cause not diagnosed).

https://bugzilla.gnome.org/show_bug.cgi?id=767002

GNOME/libsecret,GNOME/libsecret,GNOME/libsecret,GNOME/libsecret