Fix one more typo in Fortran interfaces.

Refs trac:3796

This commit was SVN r29339.

The following Trac tickets were found above:
  Ticket 3796 --> https://svn.open-mpi.org/trac/ompi/ticket/3796

ompi/mpi/fortran/use-mpi-ignore-tkr/mpi-ignore-tkr-interfaces.h.in

@@ -624,7 +624,7 @@ subroutine MPI_Comm_idup(comm, newcomm, request, ierror)
   integer, intent(out) :: newcomm
   integer, intent(out) :: request
   integer, intent(out) :: ierror
-end subroutine MPI_Comm_dup
+end subroutine MPI_Comm_idup
 
 end interface