Corrected the signatures of the collectives used by the Fortran 2008
interface to state correct intent for inout arguments and use the
ASYNCHRONOUS attribute in non-blocking collective calls.
Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
(cherry picked from commit f750c6932c845b65d059f05aae3a3b6205853aa4)