perlPackages.PerlIOLayers: add perlPreHook for $LD override

Fix a potential issue on where a compiler-only flag like
`-mmacosx-version-min=10.12` is passed to plain `ld` instead.

pkgs/top-level/perl-packages.nix

@@ -16642,6 +16642,7 @@ let
       url = "mirror://cpan/authors/id/L/LE/LEONT/PerlIO-Layers-0.012.tar.gz";
       sha256 = "1psaq3kwlk7g9rxvgsacfjk2mh6cscqf4xl7ggfkzfrnz91aabal";
     };
+    perlPreHook = "export LD=$CC";
     meta = {
       description = "Querying your filehandle's capabilities";
       license = with lib.licenses; [ artistic1 gpl1Plus ];