Scripts: Do not use ksh

src/make_accessor_class_hash.ksh

@@ -1,4 +1,4 @@
-#!/usr/bin/ksh
+#!/bin/sh
 set -ex
 cat > accessor_class_list.gperf <<EOF
 %{
@@ -14,6 +14,9 @@ cat grib_accessor_factory_hash_list | sed 's/\/\*/#/g' >> accessor_class_list.gp
 
 # editing grib_accessor_classes_hash.c
 
+gperf --version
+echo
+
 gperf -C -W classes -t -G -H grib_accessor_classes_get_id -N grib_accessor_classes_hash -m 1 -j 1 accessor_class_list.gperf |\
     sed s/__inline//g | sed s/inline//g > grib_accessor_classes_hash.c