Add support for GSS_C_NT_COMPOSITE_EXPORT

https://github.com/krb5/krb5/commit/8626fe9fb6cb14e92b84a68fca5209d0ee656f74
Author: Luke Howard <lukeh@padl.com>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: 8626fe9fb6cb14e92b84a68fca5209d0ee656f74
Branch: master
 src/lib/gssapi/generic/gssapi_ext.h     |    1 +
 src/lib/gssapi/generic/gssapi_generic.c |  122 ++++++++++++++++--------------
 src/lib/gssapi/generic/oid_ops.c        |    1 +
 src/lib/gssapi/krb5/import_name.c       |    5 +-
 src/lib/gssapi/krb5/inq_names.c         |    4 +
 src/lib/gssapi/libgssapi_krb5.exports   |    1 +
 src/lib/gssapi/mechglue/g_imp_name.c    |    2 +-
 7 files changed, 76 insertions(+), 60 deletions(-)