Make a few libraries loadable in isolation

Make a few libraries loadable in isolation

* lisp/calc/calc-menu.el: Make it loadable in isolation.

* lisp/gnus/gnus-vm.el: Make it loadable without VM.
(gnus-vm-make-folder, gnus-summary-save-in-vm): Require 'vm.
(vm-forward-message, vm-reply, vm-mail): Remove unused autoloads.

* lisp/net/eudcb-bbdb.el: Make it loadable without bbdb.
(eudc-bbdb-filter-non-matching-record, eudc-bbdb-extract-phones)
(eudc-bbdb-extract-addresses, eudc-bbdb-format-record-as-result)
(eudc-bbdb-query-internal): Require 'bbdb.