Filter enctypes in gss_set_allowable_enctypes()

Instead of erroring out when any invalid enctypes are present in the
caller's list, filter out the invalid ones and only error if no
enctypes remain.

https://github.com/krb5/krb5/commit/37ab7ea128a4c2aa2dad65ab9006baded5335bc7
Author: Greg Hudson <ghudson@mit.edu>
Commit: 37ab7ea128a4c2aa2dad65ab9006baded5335bc7
Branch: master
 src/lib/gssapi/krb5/set_allowable_enctypes.c |   29 ++++++++++++-------------
 1 files changed, 14 insertions(+), 15 deletions(-)