Add missing Apache license header, fix #1781
diff --git a/misc/ninja_syntax.py b/misc/ninja_syntax.py
index ebe6490..ab5c0d4 100644
--- a/misc/ninja_syntax.py
+++ b/misc/ninja_syntax.py
@@ -1,5 +1,19 @@
#!/usr/bin/python
+# Copyright 2011 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
"""Python module for generating .ninja files.
Note that this is emphatically not a required piece of Ninja; it's
