Change _acquire_isa_tc() to an anon sub
Change _acquire_isa_tc() to an anon sub

We're only using this because it is somewhat awkward to write out the
fully-qualified function name; there's no need for this shortcut method
to be an actual method, or for anything else to be able to use it,
either.

RsrchBoy/moosex-attributeshortcuts,RsrchBoy/moosex-attributeshortcuts