parsers: alias more PyInt* symbols on Python 3

I feel dirty for having to do this. But this is currently our approach
for dealing with PyInt -> PyLong in Python 3 for this file.

This removes a ton of compiler warnings by fixing unresolved symbols.

mercurial/parsers.c

@@ -20,7 +20,10 b''
  * 3 to compile. We should remove this once Python 3 support is fully
  * supported and proper types are used in the extensions themselves. */
 #define PyInt_Type PyLong_Type
+#define PyInt_Check PyLong_Check
 #define PyInt_FromLong PyLong_FromLong
+#define PyInt_FromSsize_t PyLong_FromSsize_t
+#define PyInt_AS_LONG PyLong_AS_LONG
 #define PyInt_AsLong PyLong_AsLong
 #endif