Migrate to Python 3
Python 2 will not be maintained past April 2020. Fortunately our scripts
require almost no changes to continue working under Python 3.
This patch forces the use of `python3` binary for all `action*` build
targets in GN and updates hashbang directives in our scripts.
Change-Id: Ic34ac547dfe5f85023ddcf4d1a969818f94a72fb
diff --git a/build/make.py b/build/make.py
index 75f0b7b..15cce9b 100644
--- a/build/make.py
+++ b/build/make.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright 2019 The Hafnium Authors.
#