Patch #2477: Added from __future__ import unicode_literals

The new PyParser_*Ex() functions are based on Neal's suggestion and initial patch. The new __future__ feature makes all '' and r'' unicode strings. b'' and br'' stay (byte) strings.
diff --git a/Include/parsetok.h b/Include/parsetok.h
index 808c72c..ec1eb6f 100644
--- a/Include/parsetok.h
+++ b/Include/parsetok.h
@@ -28,6 +28,7 @@
 #endif
 
 #define PyPARSE_PRINT_IS_FUNCTION       0x0004
+#define PyPARSE_UNICODE_LITERALS        0x0008
 
 
 
@@ -41,11 +42,18 @@
 PyAPI_FUNC(node *) PyParser_ParseFileFlags(FILE *, const char *, grammar *,
 						 int, char *, char *,
 						 perrdetail *, int);
+PyAPI_FUNC(node *) PyParser_ParseFileFlagsEx(FILE *, const char *, grammar *,
+						 int, char *, char *,
+						 perrdetail *, int *);
 
 PyAPI_FUNC(node *) PyParser_ParseStringFlagsFilename(const char *,
 					      const char *,
 					      grammar *, int,
                                               perrdetail *, int);
+PyAPI_FUNC(node *) PyParser_ParseStringFlagsFilenameEx(const char *,
+					      const char *,
+					      grammar *, int,
+                                              perrdetail *, int *);
 
 /* Note that he following function is defined in pythonrun.c not parsetok.c. */
 PyAPI_FUNC(void) PyParser_SetError(perrdetail *);