[PATCH] releasing gss_supported_mechs

[Markus Schmidt]

https://bugzilla.mindrot.org/show_bug.cgi?id=2982

Added a new patch to the above patch, because it turns out that, besides 
being freed via gss_release_oid_set, it would be better to do this at 
the end of the userauth2() function.

The reason is, that gss_cleanup is called multiple times when initially 
more than one gss-method is reported/tried.  The gss_supported_mechs 
list should persist over all tries.


Markus