[krbdev.mit.edu #6561] No option to only build client and libs

[Greg Hudson via RT]

By the standards of most modern software packages, the entirety of krb5
builds in very little time and takes very little space.  Moreover, most
people do not build krb5 themselves; they get it from an OS
distribution.  OS packages typically build all of krb5 and then split up
the result into multiple binary packages, so they do not need build
system support to separate clients, libraries, and so forth.

Do you have a particular need in this regard?  If this is just a matter
of principle, I don't think we want to further complicate our build system.