Most Perl scripts already used it. Sync up the few outliers.
Closes #14029
-#!/usr/bin/perl
+#!/usr/bin/env perl
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# SPDX-License-Identifier: curl
-#!/usr/bin/perl
+#!/usr/bin/env perl
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# SPDX-License-Identifier: curl
-#!/usr/bin/perl
+#!/usr/bin/env perl
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# SPDX-License-Identifier: curl
-#!/usr/bin/perl
+#!/usr/bin/env perl
#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
-#!/usr/bin/perl
+#!/usr/bin/env perl
#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |