Supress generating dfe snapshot on Windows.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index bc5f84f07aef9d10ab8e47c4c5be630850efa00d..8f6dcf83cd8ed2a8e7b58c35bbbd4c67211b98f1 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -42,10 +42,13 @@ group("runtime") {
     "runtime/bin:sample_extension",
     "runtime/bin:test_extension",
     "runtime/vm:patched_sdk",
-
-    # TODO(rmacnak): Link this into 'dart'
-    "utils/kernel-service:kernel-service",
   ]
+
+  # TODO(28532): Enable on Windows.
+  # TODO(rmacnak): Link this into 'dart'
+  if (target_os != "windows") {
+    deps += [ "utils/kernel-service:kernel-service" ]
+  }
 }
 
 group("runtime_precompiled") {