[krbdev.mit.edu #1157] KfM needs to build krb5 clients and libraries separately

[Ken Raeburn via RT]

Looks to me like "make MY_SUBDIRS='util include lib'" might be enough,
at least for a start...
Does it need to be something constant and supported across releases?
Oh, that doesn't get the krb524 library.  But we were talking about
integrating it, or at least parts of it, into the krb5 library; we could
just do that for 1.3 and not worry about it.