e2fsprogs: avoid outputChecks on darwin

And the problem is probably the same on other non-glibc platforms, too.
Hydra logs don't show these kind of errors, but here's a build:
https://hydra.nixos.org/build/306371286

/cc the PR that caused the issue: #431959

pkgs/by-name/e2/e2fsprogs/package.nix

···
 
   enableParallelBuilding = true;
 
-  outputChecks = {
+  # non-glibc gettext has issues with this
+  outputChecks = lib.optionalAttrs stdenv.hostPlatform.isGnu {
     bin.disallowedRequisites = [
       bash
       bashNonInteractive