build: Resync our copy of introspection.m4
build: Resync our copy of introspection.m4

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