Revert "rav1e: use new Darwin SDK pattern"

Too many rebuilds.

This reverts commit c4a4f958cb.

pkgs/by-name/ra/rav1e/package.nix

@@ -5,6 +5,8 @@
   rustPlatform,
   fetchCrate,
   cargo-c,
+  darwin,
+  libiconv,
   nasm,
   nix-update-script,
   testers,
@@ -27,6 +29,11 @@ rustPlatform.buildRustPackage rec {
     nasm
   ];
 
+  buildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
+    libiconv
+    darwin.apple_sdk.frameworks.Security
+  ];
+
   postPatch =
     ''
       # remove feature that requires libgit2 and is only used to print a version string