register.c, and the plugin.c for various plugins, are generated by tools
that must be available to do a build, and aren't distributed as part of
the source tarball. That means "make distclean" should remove them. Do
so.
Change-Id: I9e37abdafb50234cf1ebb5fb828446e45e605d78
Reviewed-on: https://code.wireshark.org/review/21125
Reviewed-by: Guy Harris <guy@alum.mit.edu>