Remove requirement for gawk in testsuite
Remove requirement for gawk in testsuite

switch is a GNU extension - not supported, for example, by the default
installation of awk on Ubuntu.

gerdstolpmann/ocaml,msprotz/ocaml,msprotz/ocaml,yunxing/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,yunxing/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,msprotz/ocaml,yunxing/ocaml,msprotz/ocaml,eliberis/ocaml,eliberis/ocaml,eliberis/ocaml