pythonPackages.cvxopt: temporarily disable tests (#43564)

The tests have transient failures that will be fixed once staging is
merged.

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

@@ -46,6 +46,11 @@ buildPythonPackage rec {
     export CVXOPT_FFTW_INC_DIR=${fftw.dev}/include
   '';
 
+  # https://github.com/cvxopt/cvxopt/issues/122
+  # This is fixed on staging (by #43234, status 2018-07-15), but until that
+  # lands we should disable the tests. Otherwise the 99% of use cases that
+  # should be unaffected by that failure are affected.
+  doCheck = false;
   checkPhase = ''
     ${python.interpreter} -m unittest discover -s tests
   '';