tools: preprocess: Ensure we use python3 interpreter

Not being explicit about the correct python interpreter causes trouble
on distros that do not alias python to python3 and/or that do not
install python2 by default.

Reported by: Mirko Covizzi <mrkcvzz@gmail.com>
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/preprocess.py b/tools/preprocess.py
index 4c43c2a..0cd3bdf 100755
--- a/tools/preprocess.py
+++ b/tools/preprocess.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # SPDX-License-Identifier: LGPL-3.0-or-later
 # Copyright (C) 2020 Daniel Thompson