add libgnuform, libgnumenu, and libgnupanel to list of exceptions.
add libgnuform, libgnumenu, and libgnupanel to list of exceptions.

nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,pagodabox/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,pagodabox/nanobox-docker-build