Rough edge to clean up

[Hal Murray]

esr at thyrsus.com said:
> There are three uses in libntp/macencrypt.c.  Two of them are MAC
> computations that do require crypto security.  You found the third, which
> doesn't. The flag seems to be intended to tag hashes that don't require
> crypto security, so we seem to be OK so far. 

If we need crypto security someplace in the package, why not take advantage 
of it some other place?

My suggestion would be to just delete those 4 lines.


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