tools: prepare ./tools/compress_json.py for Python 3

PR-URL: nodejs#24889
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
(cherry picked from commit ad7ddfb)

tools/compress_json.py

@@ -5,6 +5,12 @@
 import sys
 import zlib
 
+try:
+    xrange          # Python 2
+except NameError:
+    xrange = range  # Python 3
+
+
 if __name__ == '__main__':
   fp = open(sys.argv[1])
   obj = json.load(fp)