[llvm-build] Make Py3 compatible.

llvm-svn: 188424
diff --git a/llvm/utils/llvm-build/llvmbuild/util.py b/llvm/utils/llvm-build/llvmbuild/util.py
index e581af2..ca021c4 100644
--- a/llvm/utils/llvm-build/llvmbuild/util.py
+++ b/llvm/utils/llvm-build/llvmbuild/util.py
@@ -3,7 +3,7 @@
 
 def _write_message(kind, message):
     program = os.path.basename(sys.argv[0])
-    print >>sys.stderr, '%s: %s: %s' % (program, kind, message)
+    sys.stderr.write('%s: %s: %s\n' % (program, kind, message))
 
 note = lambda message: _write_message('note', message)
 warning = lambda message: _write_message('warning', message)