krb5: use nondeprecated functions #2356
Use the nondeprecated functions to avoid deprecation warnings.
gss_seal/gss_unseal have been deprecated in favor of gss_wrap/gss_unwrap with GSS-API v2 from January 1997 . The first version of "The Kerberos Version 5 GSS-API Mechanism"  from June 1996 already says "GSS_Wrap() (formerly GSS_Seal())" and "GSS_Unwrap() (formerly GSS_Unseal())". Use the nondeprecated functions to avoid deprecation warnings.  https://tools.ietf.org/html/rfc2078  https://tools.ietf.org/html/rfc1964