[krbdev.mit.edu #6715] cksum_body exports

[Jeff Blaine via RT]

v1.8

I'm pretty sure this mismatch is a bug:

# cd src/plugins/preauth/cksum_body
# cat cksum_body.exports
preauthentication_client_0
preauthentication_server_0
# grep preauthentication_ *.c
struct krb5plugin_preauth_client_ftable_v1 preauthentication_client_1 = {
struct krb5plugin_preauth_server_ftable_v1 preauthentication_server_1 = {
#