Cleanups from the remove-native-krb5 patch

Magnus Hagander <magnus@hagander.net>

Commit: 0294023a6b1c5df7683707a77238ab634d4ea8c1
Author: Magnus Hagander <magnus@hagander.net>
Date: 2014-03-16T14:22:45Z
Releases: 9.4.0
Cleanups from the remove-native-krb5 patch

krb_srvname is actually not available anymore as a parameter server-side, since
with gssapi we accept all principals in our keytab. It's still used in libpq for
client side specification.

In passing remove declaration of krb_server_hostname, where all the functionality
was already removed.

Noted by Stephen Frost, though a different solution than his suggestion

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