The GSS mechglue uses singly linked lists for mechanisms and mechanism objects,
to which new entries are inserted at the head. This breaks ordering of
mechanisms specified in OID sets and in /etc/gss/mech, as they will be back to
front. Use a tail queue instead so that new entries are inserted at the end.
The pname to uid functionality at present assumes there is
an implementation of getpwnam() and that the local user
identifier is an integer. On Windows, the local user identifier
is a SId. Add NO_LOCALNAME as a build option so that Windows
(for now) can build without providing a getpwnam() implementation.
Change-Id: I04cfd6d2cd52e6228733f1da1dab420b453e6566
