gyp: switch json for pprint when generating config

configure

@@ -2,13 +2,12 @@
 
 import optparse
 import os
-import json
+import pprint
 import subprocess
 import sys
 
 root_dir = os.path.dirname(__file__)
 sys.path.insert(0, os.path.join(root_dir, 'deps', 'v8', 'tools'))
-import utils # GuessArchitecture
 
 # parse our options
 parser = optparse.OptionParser()
@@ -262,7 +261,7 @@ print "creating ", fn
 
 f = open(fn, 'w+')
 f.write("# Do not edit. Generated by the configure script.\n")
-json.dump(output, f, indent=2, skipkeys=True)
+pprint.pprint(output, stream=f, indent=2)
 f.write("\n")
 f.close()