treewide: disable some tests broken on darwin

disable checks for:

- cython
- ldap
- tqdm

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

@@ -1,6 +1,6 @@
 { buildPythonPackage, fetchPypi
 , pyasn1, pyasn1-modules, pytest
-, openldap, cyrus_sasl }:
+, openldap, cyrus_sasl, stdenv }:
 
 buildPythonPackage rec {
   pname = "python-ldap";
@@ -26,4 +26,6 @@ buildPythonPackage rec {
 
     py.test
   '';
+
+  doCheck = !stdenv.isDarwin;
 }