Restore makedepend capabilities for Windows and VMS

This got lost somehow.  The methods to do makedepend on Windows and
VMS are hard coded for cl (Windows) and CC/DECC (VMS), because that's
what we currently support natively.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4907)