xgboost: disable TestXGBoostLib when cudaSupport

...because the test suite includes .cu files so it won't run in the
sandbox, isolated from gpu

pkgs/development/libraries/xgboost/default.nix

···
 
   inherit doCheck;
 
+  # By default, cmake build will run ctests with all checks enabled
+  # If we're building with cuda, we run ctest manually so that we can skip the GPU tests
+  checkPhase = lib.optionalString cudaSupport ''
+    ctest --force-new-ctest-process ${lib.optionalString cudaSupport "-E TestXGBoostLib"}
+  '';
+
   installPhase = let
     libname = "libxgboost${stdenv.hostPlatform.extensions.sharedLibrary}";
   in ''