build: Include $(top_builddir)
build: Include $(top_builddir)

Fixes compilation in cases where builddir != srcdir.

ebassi/json-glib,frida/json-glib,ebassi/json-glib,GNOME/json-glib,frida/json-glib,Distrotech/json-glib,GNOME/json-glib,Distrotech/json-glib,ebassi/json-glib,Distrotech/json-glib