tools: make getnodeversion.py python3-compatible

PR-URL: nodejs#21872
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
(cherry picked from commit 287521d)

tools/getnodeversion.py

@@ -17,4 +17,4 @@
   if re.match('^#define NODE_PATCH_VERSION', line):
     patch = line.split()[2]
 
-print '%(major)s.%(minor)s.%(patch)s'% locals()
+print('%(major)s.%(minor)s.%(patch)s'% locals())