Patch by Jean Wolter to fix a bug where a script wouldnt be executed

unless it had #!/bin/sh in the first line

"It correctly locates the script, tries to execute it via execve which
fails. After that it tries to hand it over to /bin/sh which fails too,
since ash

    - neither provides the absolute pathname to /bin/sh
    - nor tries to lookup the script via PATH if called as "sh script"
"

shell/ash.c

@@ -3729,7 +3729,10 @@ repeat:
 		for (ap = argv; *ap; ap++)
 			;
 		ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
-		*ap++ = cmd = (char *)DEFAULT_SHELL;
+		ap[1] = cmd;
+		*ap = cmd = (char *)DEFAULT_SHELL;
+		ap += 2;
+		argv++;
 		while ((*ap++ = *argv++))
 			;
 		argv = new;