tools: add chakra_tdd.h to install.py

chakra_tdd.h was added to the sources. This adds it to install.py to
be included in the headers package.

Refs: nodejs#397
Fixes: nodejs#417

tools/install.py

@@ -176,6 +176,9 @@ def headers(action):
   if 'v8' == variables.get('node_engine'):
     subdir_files('deps/v8/include', 'include/node/', action)
   elif 'chakracore' == variables.get('node_engine'):
+    action([
+      'src/chakra_ttd.h'
+    ], 'include/node/')
     subdir_files('deps/chakrashim/include', 'include/node/', action)
     subdir_files('deps/chakrashim/src', 'include/node/', action)
   else: