Extend ACL-restriction to all Windows tools.

Protecting our processes from outside interference need not be limited
to just PuTTY: there's no reason why the other SSH-speaking tools
shouldn't have the same treatment (PSFTP, PSCP, Plink), and PuTTYgen
and Pageant which handle private key material.

pscp.c

@@ -2349,6 +2349,8 @@ int psftp_main(int argc, char *argv[])
     argv += i;
     back = NULL;
 
+    platform_psftp_post_option_setup();
+
     if (list) {
 	if (argc != 1)
 	    usage();