Check PATENTS does not creep into files

Summary:
Some files have crept into the repo with the old license header. These are usually from PRs that were opened prior to the re-licensing of the project.

Let the script run, prior to fixing the errant files. The script outputs the following:

```
PATENTS crept into some new files?
 --- /dev/fd/63	2018-03-01 01:42:48.250153746 +0000
+++ /dev/fd/62	2018-03-01 01:42:48.250153746 +0000
@@ -1 +1,9 @@
+Libraries/NativeAnimation/Nodes/RCTTrackingAnimatedNode.h
+Libraries/NativeAnimation/Nodes/RCTTrackingAnimatedNode.m
+ReactAndroid/src/main/java/com/facebook/react/animated/TrackingAnimatedNode.java
+ReactAndroid/src/main/java/com/facebook/react/views/text/CustomLetterSpacingSpan.java
+ReactCommon/yoga/yoga/YGLayout.cpp
+ReactCommon/yoga/yoga/YGLayout.h
+ReactCommon/yoga/yoga/YGStyle.cpp
+ReactCommon/yoga/yoga/YGStyle.h
 scripts/circleci/check_license.sh
Exited with code 1
```

Fix the headers in these files and run the script again. No output, exit code 0.
Closes facebook/react-native#18143

Reviewed By: sophiebits

Differential Revision: D7119356

Pulled By: hramos

fbshipit-source-id: d238e4d4a3ae320a2c8e625c2fa29690057a4814

lib/yoga/src/main/cpp/yoga/YGLayout.cpp

@@ -1,11 +1,10 @@
 /**
  * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
  *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
  */
+
 #include "YGLayout.h"
 #include "Utils.h"
 

lib/yoga/src/main/cpp/yoga/YGLayout.h

@@ -1,11 +1,10 @@
 /**
  * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
  *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
  */
+
 #pragma once
 #include "Yoga-internal.h"
 

lib/yoga/src/main/cpp/yoga/YGStyle.cpp

@@ -1,11 +1,10 @@
 /**
  * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
  *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
  */
+
 #include "YGStyle.h"
 
 const YGValue kYGValueUndefined = {YGUndefined, YGUnitUndefined};

lib/yoga/src/main/cpp/yoga/YGStyle.h

@@ -1,11 +1,10 @@
 /**
  * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
  *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
  */
+
 #pragma once
 #include "Yoga-internal.h"
 #include "Yoga.h"