python3: break infinite recursion

Checking if openssl is a derivation requires evaluating stdenv.cc, which
depends on mlibc when cross compiling to a mlibc platform, which depends
on meson, which depends on Python.

See previous commit 0070883 on why the recursion break happens in the
Python expression.

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

@@ -129,8 +129,8 @@ let
 
   passthru = let
     # When we override the interpreter we also need to override the spliced versions of the interpreter
-    # bluez is excluded manually to break an infinite recursion.
-    inputs' = lib.filterAttrs (n: v: n != "bluez" && n != "passthruFun" && ! lib.isDerivation v) inputs;
+    # bluez and openssl are excluded manually to break infinite recursion errors.
+    inputs' = lib.filterAttrs (n: v: n != "bluez" && n != "openssl" && n != "passthruFun" && ! lib.isDerivation v) inputs;
     override = attr: let python = attr.override (inputs' // { self = python; }); in python;
   in passthruFun rec {
     inherit self sourceVersion packageOverrides;