Fix some perl shebangs.

Most important perl scripts already use a portable method
but fix these nevertheless.

(cherry picked from commit 93496a6c1e5b2ae1756dc9b8043e2267209387da)

Change-Id: Id8b5e974356701e66f9dd8a6bd7a58fd4f5633ae

oox/source/export/preset-definitions-to-shape-types.pl

-#! /usr/bin/perl -w
+#!/usr/bin/env perl -w
 #
 # This file is part of the LibreOffice project.
 #

sal/qa/helper/gcov/gcov_filter.pl

-#!/usr/bin/perl -w
+#!/usr/bin/env perl -w
 #
 #
 # This file is part of the LibreOffice project.

sal/qa/helper/gcov/gcov_result.pl

-#!/usr/bin/perl -w
+#!/usr/bin/env perl -w
 #
 #
 # This file is part of the LibreOffice project.

sal/qa/helper/gcov/gcov_resultcompare.pl

-#!/usr/bin/perl -w
+#!/usr/bin/env perl -w
 #
 #
 # This file is part of the LibreOffice project.

sal/qa/helper/gcov/gcov_resultinterpreter.pl

-#!/usr/bin/perl -w
+#!/usr/bin/env perl -w
 #
 #
 # This file is part of the LibreOffice project.

sal/textenc/generate/big5hkscs2001.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sal/textenc/generate/cns116431992.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sal/textenc/generate/gb180302000.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sd/res/webview/editpic.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sd/res/webview/poll.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sd/res/webview/savepic.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

sd/res/webview/show.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #

solenv/bin/image-sort.pl

-#!/usr/bin/perl -w
+#!/usr/bin/env perl -w
 # -*- Mode: Perl; tab-width: 4; indent-tabs-mode: nil -*-
 #
 # This file is part of the LibreOffice project.

sysui/desktop/share/create_mime_xml.pl

-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # This file is part of the LibreOffice project.
 #