This makes it much harder for bugs to crop up where stuff is wrongly case hacked. Fixes the nix store ls problem described in https://git.lix.systems/lix-project/lix/issues/633, but it is still a global setting which still sucks. Fixes: https://git.lix.systems/lix-project/lix/issues/726 Change-Id: Ieba18976d1fb490830db0299ee9922b4b03b453e