json-glib: Update to 0.12.4

Signed-off-by: Saul Wold <sgw@linux.intel.com>

diff --git a/meta/recipes-gnome/json-glib/json-glib_0.12.2.bb b/meta/recipes-gnome/json-glib/json-glib_0.12.4.bb
similarity index 100%
rename from meta/recipes-gnome/json-glib/json-glib_0.12.2.bb
rename to meta/recipes-gnome/json-glib/json-glib_0.12.4.bb