rewrite gss_krb5_ccache_name

[Ken Raeburn]

On Nov 21, 2008, at 23:57, Jeffrey Altman wrote:
>>> If that is the case, the real bug here is that the gssapi32.dll
>>> does not implement a DLL_THREAD_DETACH routine which would free
>>> any allocated memory stored under the registered TLS keys.
>>
>> Well, if you're not doing that, you certainly should...
>
> Indeed, this should be fixed.

Looks to me like krb5int_thread_detach_hook should mostly be doing  
that.  It's the handler in the support library, but all our TSD use is  
funneled through some bookkeeping in the support library, to improve  
things on platforms where OS handles (TLS indices, pthread keys) on  
TSD may be a limited resource.  It ought to be deallocating any  
registered per-thread data, though it looks like maybe the bookkeeping  
data itself isn't properly freed.

Ken