Revert core fixes for IO-Compress following IO-Compress update

Revert core fixes for IO-Compress following IO-Compress update

With commit 1725f55ba78fb58489ea39e2bc0cc1faffd32275 IO-Compress now puts
its .pm files in lib rather than archlib for perls later than 5.11.1, so
the core can now do likewise given that blead will next be released as
5.11.2, i.e. revert the Configure part of 4cc80fc4cbbd82e20f7b14b68abb53d552076022
and revert f4a6a713802da1b781d7108503156fa3a0fe219e.

This change should not be merged into 5.10.x because IO-Compress will
continue to put its .pm files into archlib for the sake of anyone upgrading
a 5.10.x installation in-place.