build: use print() function in configure.py

PR-URL: #24484
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

configure.py

@@ -1,3 +1,5 @@
+from __future__ import print_function
+
 import json
 import sys
 import errno
@@ -608,7 +610,7 @@ def print_verbose(x):
   if not options.verbose:
     return
   if type(x) is str:
-    print x
+    print(x)
   else:
     pprint.pprint(x, indent=2)