Use /usr/bin/env to invoke perl like the other test scripts.

tests/ftpserver.pl

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #***************************************************************************
 #                                  _   _ ____  _
 #  Project                     ___| | | |  _ \| |

tests/httpsserver.pl

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # $Id$
 # This is the HTTPS server designed for the curl test suite.