The function itself does not depend on the macro. Move it outside
of the ifdef guard and remove the identical copy in XWIN.
This is step 1 towards removing the duplication in winauth.c and moving
the OS specifics to os/
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Jon Turney <jon.turney@dronecode.org.uk>