Not building kcpytkt/kdeltkt

[Ken Hornstein]

>>>We expanded the backends that implement krb5_cc_remove_cred() due to
>>>samba's usage:
>>
>> I mean, fair enough ... but how did you test those backends?
>
>krb5's test suite covers them:
>https://github.com/krb5/krb5/blob/master/src/lib/krb5/ccache/t_cc.c

I _did_ see that, but it only covers MEMORY, FILE, and KEYRING.  It
doesn't cover, for example, KCM, DIR, or MSLSA (although I am not sure
the test suite works on Windows).

--Ken