Windows 7 compatibility

Include/win7compat.h

@@ -0,0 +1,12 @@
+#define STRSAFE_E_INSUFFICIENT_BUFFER   ((HRESULT)0x8007007A)
+#define PATHCCH_ALLOW_LONG_PATHS                0x01
+#define PATHCCH_FORCE_ENABLE_LONG_NAME_PROCESS  0x02
+#define PATHCCH_FORCE_DISABLE_LONG_NAME_PROCESS 0x04
+#define PATHCCH_DO_NOT_NORMALIZE_SEGMENTS       0x08
+#define PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH  0x10
+#define PATHCCH_ENSURE_TRAILING_SLASH           0x20
+#define PATHCCH_MAX_CCH 0x8000
+
+HRESULT WINAPI PathCchCanonicalizeEx(WCHAR *out, SIZE_T size, const WCHAR *in, DWORD flags);
+HRESULT WINAPI PathCchCombineEx(WCHAR *out, SIZE_T size, const WCHAR *path1, const WCHAR *path2, DWORD flags);
+HRESULT WINAPI PathCchSkipRoot(const WCHAR *path, const WCHAR **root_end);

Modules/posixmodule.c

@@ -18,7 +18,7 @@
 
       FSCTL_GET_REPARSE_POINT is not exported with WIN32_LEAN_AND_MEAN. */
 #  include <windows.h>
-#  include <pathcch.h>
+#  include "win7compat.h"
 #endif
 
 #include "pycore_ceval.h"         // _PyEval_ReInitThreads()

PC/getpathp.c

@@ -90,7 +90,7 @@
 #endif
 
 #include <windows.h>
-#include <pathcch.h>
+#include "win7compat.h"
 #include <shlwapi.h>
 
 #ifdef HAVE_SYS_TYPES_H

PC/pyconfig.h

@@ -135,9 +135,9 @@ WIN32 is still required for the locale module.
 #endif /* MS_WIN64 */
 
 /* set the version macros for the windows headers */
-/* Python 3.9+ requires Windows 8 or greater */
-#define Py_WINVER 0x0602 /* _WIN32_WINNT_WIN8 */
-#define Py_NTDDI NTDDI_WIN8
+/* Python 3.9+ requires Windows 7 or greater */
+#define Py_WINVER 0x0601 /* _WIN32_WINNT_WIN7 */
+#define Py_NTDDI NTDDI_WIN7
 
 /* We only set these values when building Python - we don't want to force
    these values on extensions, as that will affect the prototypes and