Pass the /safeseh option to ml.exe.

test/win/linker-flags/safeseh_hello.cc

Index: test/win/linker-flags/safeseh_hello.cc
diff --git a/test/ios/app-bundle/tool_main.cc b/test/win/linker-flags/safeseh_hello.cc
similarity index 78%
copy from test/ios/app-bundle/tool_main.cc
copy to test/win/linker-flags/safeseh_hello.cc
index 9dc3c94f3431be00adb755f6515b995d734e089b..6141300d2c0a517a8f79075619d089be0ddbf2ea 100644
--- a/test/ios/app-bundle/tool_main.cc
+++ b/test/win/linker-flags/safeseh_hello.cc
@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+extern "C" {
+int zero(void);
+}
+
 int main() {
-  return 0;
+  return zero();
 }