source: vendor/bash/3.1/CWRU/sh-redir-hack

Add to `subshell' production in parse.y and recompile -DREDIRECTION_HACK to
get `< xx (command)' sh compatibility.

        |       redirections '(' list ')'
                        {
#if defined (REDIRECTION_HACK)
                          /* XXX - C News sh compatibility hack - XXX */
                          $3->redirects = $1;
                          $3->flags |= CMD_WANT_SUBSHELL;
                          $$ = $3;
#else
                          yyerror ();
                          YYABORT;
#endif
                        }