Change Perl's default to 5.24

[Tom Hukins]

On Thu, Nov 03, 2016 at 02:21:20PM +0000, bugzilla-noreply at freebsd.org wrote:
> Coro's author decided that starting at 5.22, he was forking Perl and that to
> use Coro, you would have to use his Perl.  So I'll consider it a lost cause.

There's a patch from Debian that claims to fix Coro with 5.24:
https://rt.cpan.org/Public/Bug/Display.html?id=114708

I don't know whether FreeBSD wants to apply this patch, but I thought I
should mention its existence.

Tom