Try to fix compilation of Python-ast.c on Visual Studio 2008

Parser/asdl_c.py

@@ -604,7 +604,7 @@ class PyTypesVisitor(PickleVisitor):
     def visitModule(self, mod):
         self.emit("""
 typedef struct {
-    PyObject_HEAD;
+    PyObject_HEAD
     PyObject *dict;
 } AST_object;
 

Python/Python-ast.c

@@ -456,7 +456,7 @@ static char *withitem_fields[]={
 
 
 typedef struct {
-    PyObject_HEAD;
+    PyObject_HEAD
     PyObject *dict;
 } AST_object;