GSSAPI: use rk_UNCONST() on password and cert oid
GSSAPI: use rk_UNCONST() on password and cert oid

These missed out on the rk_UNCONST()ification by virtue of being added
in a parallel branch. In the diagram below, they got added in 02cf28e,
while the rk_UNCONSTs were added in f5f9014.

* cc47c8f Turn on -Wextra -Wno-sign-compare -Wno-unused-paramter and fix issues.
*   3069d80 Merge branch 'master' into lukeh/acquire-cred-ex
|\
| * f5f9014 Warning fixes from Christos Zoulas
* | 02cf28e implement gss_acquire_cred_ex with password support
|/
* 2170219 add more oids

rk_UNCONST amounts to a cast to (void *), removing const.

Signed-off-by: Douglas Bagnall <ea5c2dd9e1e1bee052dcc821cab32bd228dd61c7@catalyst.net.nz>

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