Add __future__ import for print_function.  It's a no-op in 3.0, but it needs to not be a syntax error.
Closes issue 2436.
diff --git a/Python/future.c b/Python/future.c
index 80a3006..d6333ff 100644
--- a/Python/future.c
+++ b/Python/future.c
@@ -33,6 +33,8 @@
 			continue;
 		} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
 			continue;
+		} else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
+			continue;
 		} else if (strcmp(feature, "braces") == 0) {
 			PyErr_SetString(PyExc_SyntaxError,
 					"not a chance");