Extension Module Compat Cleanup (#29666)

Author: WillAyd

pandas/_libs/src/compat_helper.h

@@ -38,13 +38,8 @@ PANDAS_INLINE int slice_get_indices(PyObject *s,
                                     Py_ssize_t *stop,
                                     Py_ssize_t *step,
                                     Py_ssize_t *slicelength) {
-#if PY_VERSION_HEX >= 0x03000000
   return PySlice_GetIndicesEx(s, length, start, stop,
                               step, slicelength);
-#else
-  return PySlice_GetIndicesEx((PySliceObject *)s, length, start,
-                              stop, step, slicelength);
-#endif  // PY_VERSION_HEX
 }
 
 #endif  // PANDAS__LIBS_SRC_COMPAT_HELPER_H_

pandas/_libs/src/parser/io.c

@@ -17,7 +17,7 @@ The full license is in the LICENSE file, distributed with this software.
 #define O_BINARY 0
 #endif  // O_BINARY
 
-#if PY_VERSION_HEX >= 0x03060000 && defined(_WIN32)
+#ifdef _WIN32
 #define USE_WIN_UTF16
 #include <Windows.h>
 #endif