Unbreak 'make -j' by declaring the dependency that exists between the
two generated vapi files (forcing building of the second one to wait
until after the first one has been built).
https://bugzilla.gnome.org/show_bug.cgi?id=680374
include Makefile.vapigen
libnm-util.vapi: $(top_srcdir)/libnm-util/NetworkManager-1.0.gir libnm-util.deps NetworkManager-1.0.metadata
-libnm-glib.vapi: $(top_srcdir)/libnm-glib/NMClient-1.0.gir libnm-glib.deps NMClient-1.0.metadata
+libnm-glib.vapi: $(top_srcdir)/libnm-glib/NMClient-1.0.gir libnm-glib.deps NMClient-1.0.metadata libnm-util.vapi
libnm_util_vapi_METADATADIRS = $(srcdir)