circular reference between libkrb5 and libk5crypto

[John Hascall]

> How about adding to k5crypto a krb5_crypto_init_keyblock,
> with all the code from krb5_init_keyblock. Then change
> krb5_init_keyblock to call krb5_crypto_init_keyblock.

> Routines in k5crypto would always call the krb5_crypto_init_keyblock.
> Other routines that continued to call krb5_init_keyblock would still
> continue to work as expected.

What an outstanding idea...