configure: fix minor typo 'be build'->'be built'
configure: fix minor typo 'be build'->'be built'

https://bugzilla.gnome.org/show_bug.cgi?id=784739

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