bazel_0_4: mark as broken

build has failed since 2018-04-29

pkgs/development/tools/build-managers/bazel/0.4.nix

···
     license = licenses.asl20;
     maintainers = with maintainers; [ cstrahan philandstuff ];
     platforms = platforms.linux;
+    broken = true; # 2018-08-07
   };
 
   name = "bazel-${version}";