gnulib-tool.py: Fix error in Ubuntu 22.04

[Bruno Haible]

I tried running gnulib-tool.py on Ubuntu 22.04, and it failed:

bash: ./gnulib-tool.py: /usr/bin/python: bad interpreter: No such file or 
directory

This patch fixes it.


2022-07-29  Bruno Haible  <bruno@clisp.org>

        gnulib-tool.py: Fix error in Ubuntu 22.04.
        * gnulib-tool.py: Search for python3 in $PATH.

diff --git a/gnulib-tool.py b/gnulib-tool.py
index 0e5a33bf6e..f81501b9c0 100755
--- a/gnulib-tool.py
+++ b/gnulib-tool.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #
 # Copyright (C) 2002-2022 Free Software Foundation, Inc.
 #