make-hash-tools.pl: Perl 5.14 compatibility

2011-06-20 Andras Becsi <abecsi@webkit.org>

        Reviewed by Csaba OsztrogonÃ¡c.

        make-hash-tools.pl: Perl 5.14 compatibility
        https://bugs.webkit.org/show_bug.cgi?id=61890

        No new tests needed.

        * make-hash-tools.pl: Use if/elsif instead of switch/case.

Change-Id: I8b3ef2bf437d96673259edaf71a54c4973fbb097
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@89265 268f45cc-cd09-0410-ab3c-d52691b4dbfc