build: make sure we are calling python3 in all scripts

Jira: ZEP-1759
Change-Id: I0fc7329f806ca0049c555d3402dd145e92e54028
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/scripts/check_link_map.py b/scripts/check_link_map.py
index ab2082c..dcc45ce 100755
--- a/scripts/check_link_map.py
+++ b/scripts/check_link_map.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 import fileinput
 import re
 import sys