python3Packages.grpcio: remove cctools from build inputs

This fixes `aarch64-darwin` build in #105026. Without this the `strip` in `PATH`
is the one from `darwin.cctools`, which doesn't preserve code signatures,
resulting in code that cannot run and pass `pythonImportsCheckPhase`.

The dependency on cctools was introduced in #44902 in 2018,
but it doesn't seem to be necessary on `x86_64-darwin` today.

pkgs/development/python-modules/grpcio/default.nix

@@ -1,6 +1,5 @@
 { lib, stdenv
 , buildPythonPackage
-, darwin
 , grpc
 , six
 , protobuf
@@ -20,8 +19,7 @@ buildPythonPackage rec {
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [ cython pkg-config ]
-    ++ lib.optional stdenv.isDarwin darwin.cctools;
+  nativeBuildInputs = [ cython pkg-config ];
 
   buildInputs = [ c-ares openssl zlib ];
   propagatedBuildInputs = [ six protobuf ]