treewide: disable some tests broken on darwin

disable checks for:

- cython
- ldap
- tqdm

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

@@ -48,6 +48,8 @@ in buildPythonPackage rec {
         ''--exclude="(${builtins.concatStringsSep "|" excludedTests})"''}
   '';
 
+  doCheck = !stdenv.isDarwin;
+
   patches = [
     # The following is in GitHub in 0.28.3 but not in the `sdist`.
     # https://github.com/cython/cython/issues/2319

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;
 }

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

@@ -5,6 +5,7 @@
 , coverage
 , glibcLocales
 , flake8
+, stdenv
 }:
 
 buildPythonPackage rec {
@@ -26,6 +27,8 @@ buildPythonPackage rec {
 
   LC_ALL="en_US.UTF-8";
 
+  doCheck = !stdenv.isDarwin;
+
   meta = {
     description = "A Fast, Extensible Progress Meter";
     homepage = https://github.com/tqdm/tqdm;