cext: remove Python 2 support

We still alias the Python 2 symbols. This will be cleaned up in a
separate commit.

Differential Revision: https://phab.mercurial-scm.org/D12227

mercurial/cext/parsers.c

@@ -17,7 +17,6 b''
 #include "charencode.h"
 #include "util.h"
 
-#ifdef IS_PY3K
 /* The mapping of Python types is meant to be temporary to get Python
  * 3 to compile. We should remove this once Python 3 support is fully
  * supported and proper types are used in the extensions themselves. */
@@ -25,13 +24,6 b''
 #define PyInt_FromLong PyLong_FromLong
 #define PyInt_FromSsize_t PyLong_FromSsize_t
 #define PyInt_AsLong PyLong_AsLong
-#else
-/* Windows on Python 2.7 doesn't define S_IFLNK. Python 3+ defines via
- * pyport.h. */
-#ifndef S_IFLNK
-#define S_IFLNK 0120000
-#endif
-#endif
 
 static const char *const versionerrortext = "Python minor version mismatch";