introspection: Add more annotations for GFile
introspection: Add more annotations for GFile

Add annotations fixing warnings in GFile.

https://bugzilla.gnome.org/show_bug.cgi?id=629347

johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib