Python 3 compatibility

test/mac/gyptest-postbuild-fail.py

Index: test/mac/gyptest-postbuild-fail.py
diff --git a/test/mac/gyptest-postbuild-fail.py b/test/mac/gyptest-postbuild-fail.py
index 9cd5d47d28bf3e4ba020de4aea355da73eefdf0b..f7502ea10a3a0111d5b9fc8005ef12474f26da6c 100755
--- a/test/mac/gyptest-postbuild-fail.py
+++ b/test/mac/gyptest-postbuild-fail.py
@@ -8,6 +8,8 @@
 Verifies that a failing postbuild step lets the build fail.
 """
 
+from __future__ import print_function
+
 import TestGyp
 
 import sys
@@ -39,7 +41,7 @@ if sys.platform == 'darwin':
                          stderr=subprocess.STDOUT)
   out, err = job.communicate()
   if job.returncode != 0:
-    print out
+    print(out)
     raise Exception('Error %d running xcodebuild' % job.returncode)
   if out.startswith('Xcode 3.'):
     test.pass_test()