Revert "fortran:fix integer kind=8 problem"

turns out there's more to do here.  many functions aren't actually
treating the string len arg correctly in the use-mpi-f08 folder

This reverts commit 32db65f.

Author: hppritcha

ompi/mpi/fortran/use-mpi-f08/bindings/mpi-f-interfaces-bind.h

@@ -4005,12 +4005,12 @@ end subroutine ompi_session_get_info_f
 
 subroutine ompi_session_get_nth_pset_f(session, info, n, pset_len, pset_name, ierror, pset_name_len) &
    BIND(C, name="ompi_session_get_nth_pset_f")
-   use, intrinsic :: ISO_C_BINDING, only : C_CHAR
+   use, intrinsic :: ISO_C_BINDING, only : C_CHAR, C_INT
    implicit none
    INTEGER, INTENT(IN) :: session
    INTEGER, INTENT(IN) :: info
    INTEGER, INTENT(IN) :: n
-   INTEGER, VALUE, INTENT(IN) :: pset_name_len
+   INTEGER(KIND=C_INT), VALUE, INTENT(IN) :: pset_name_len
    INTEGER, INTENT(INOUT) :: pset_len
    CHARACTER(KIND=C_CHAR), DIMENSION(*), INTENT(OUT) :: pset_name
    INTEGER, INTENT(out) :: ierror