zstd: Fix install name on macOS

It had an install name '/usr/local/lib/libzstd.1.dylib'.

pkgs/tools/compression/zstd/default.nix

@@ -1,4 +1,5 @@
 { stdenv, fetchFromGitHub, gnugrep
+, fixDarwinDylibNames
 , legacySupport ? false }:
 
 stdenv.mkDerivation rec {
@@ -12,6 +13,8 @@ stdenv.mkDerivation rec {
     owner = "facebook";
   };
 
+  buildInputs = stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames;
+
   makeFlags = [
     "ZSTD_LEGACY_SUPPORT=${if legacySupport then "1" else "0"}"
   ];