Rename "make-reg-dotc" to "make-dissector-reg", and do the same for the

Rename "make-reg-dotc" to "make-dissector-reg", and do the same for the
Python versions, as it no longer makes only "register.c", it can also
make a "plugin.c" file for a plugin.

When making "plugin.c", there's no need to include "register.h", as it's
not defining any functions declared there.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@17919 f5534014-38df-0310-8fa8-9805f1628bb7