build: include missing V8 headers in distribution

Fixes: nodejs/Release#704

Author: targos

tools/install.py

@@ -176,14 +176,18 @@ def wanted_v8_headers(files_arg, dest):
       'deps/v8/include/libplatform/v8-tracing.h',
       'deps/v8/include/v8.h',
       'deps/v8/include/v8-array-buffer.h',
+      'deps/v8/include/v8-callbacks.h',
       'deps/v8/include/v8-container.h',
       'deps/v8/include/v8-context.h',
       'deps/v8/include/v8-data.h',
       'deps/v8/include/v8-date.h',
       'deps/v8/include/v8-debug.h',
+      'deps/v8/include/v8-embedder-heap.h',
       'deps/v8/include/v8-exception.h',
       'deps/v8/include/v8-extension.h',
       'deps/v8/include/v8-external.h',
+      'deps/v8/include/v8-forward.h',
+      'deps/v8/include/v8-function-callback.h',
       'deps/v8/include/v8-function.h',
       'deps/v8/include/v8-initialization.h',
       'deps/v8/include/v8-internal.h',