Integrate ninja build with Visual Studio

test/msvs/external_builder/hello.z

Index: test/msvs/external_builder/hello.z
diff --git a/test/self-dependency/self_dependency.gyp b/test/msvs/external_builder/hello.z
similarity index 55%
copy from test/self-dependency/self_dependency.gyp
copy to test/msvs/external_builder/hello.z
index 0ca76c669b6a686bf686c5b9a4be5e9ebc2b2c41..aa478827b50f552feae808e98e83275669ffa808 100644
--- a/test/self-dependency/self_dependency.gyp
+++ b/test/msvs/external_builder/hello.z
@@ -2,14 +2,5 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-{
-  'includes': [
-    'common.gypi',
-  ],
-  'targets': [
-    {
-      'target_name': 'a',
-      'type': 'none',
-    },
-  ],
-}
+This file will be passed to the test rule.
+