cpython: skip macOS system frameworks

We don’t want cpython picking up /Library/Frameworks and
/System/Library/Frameworks which contains Tcl.framework. Instead it
should use the one provided by Nix. this would not be an issue if
sandboxing was enabled, but unfortunately that has its own issues.

Fixes #66647

pkgs/development/interpreters/python/cpython/default.nix

@@ -83,6 +83,8 @@ in with passthru; stdenv.mkDerivation {
   prePatch = optionalString stdenv.isDarwin ''
     substituteInPlace configure --replace '`/usr/bin/arch`' '"i386"'
     substituteInPlace configure --replace '-Wl,-stack_size,1000000' ' '
+  '' + optionalString (stdenv.isDarwin && x11Support) ''
+    substituteInPlace setup.py --replace /Library/Frameworks /no-such-path
   '';
 
   patches = [