Add pypy3 remove ruby which now appears to go to /usr/local/bin
Put perl in its place.

I don't know if this is fully good enough, doing:

    perl -Mlocal::lib

or following
http://search.cpan.org/~haarg/local-lib-2.000015/lib/local/lib.pm

does two other options and tells you to set all of them via eval'ing
some garbage. I'd guess those two are related to new installs. Possibly
I'll come back and set them later.

But this makes irssi find modules.
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