krb5_gss_register_acceptor_identity sets a mutex-locked global (not
thread-specific) variable containing a keytab name.  This change
allows the variable to be unset by passing a null value.

A more elegant long-term solution to the problem is Heimdal's
gss_krb5_import_cred function.


https://github.com/krb5/krb5/commit/41103fb180d78f349a5c3fe45f96008b50a11587
Commit By: ghudson
Revision: 24242
Changed Files:
U   trunk/src/lib/gssapi/krb5/acquire_cred.c
U   trunk/src/lib/gssapi/krb5/krb5_gss_glue.c