[Bins] utf8 problem in bins_edit with perl < 5.8

[Robert Funnell]

At some point the check 'if $^V ge v5.8.0' was added to the source of
bins, to avoid a problem with older versions of Perl not recognising
the reference to utf8 in 'binmode($fileHandler, ":utf8")'. Would it be
possible to add this same check to bins_edit?

I'm running Debian stable, which uses Perl 5.6.1. By adding the check
for perl < 5.8 I was able to get bins_edit to run.

- Robert