python: Update to 3.9.5

All the dropped changes seem no longer be needed (static is off by default,
the cygwin patch for .exe is upstream)

python/900-msysize.patch

@@ -140,14 +140,6 @@ diff -Naur Python-3.8.2-orig/config.guess Python-3.8.2/config.guess
              ;;
 --- Python-3.8.7.orig/Lib/ctypes/__init__.py	2020-12-21 17:25:24.000000000 +0100
 +++ Python-3.8.7/Lib/ctypes/__init__.py	2021-05-11 22:26:25.866873900 +0200
-@@ -1,6 +1,6 @@
- """create and manipulate C data types in Python"""
- 
--import os as _os, sys as _sys
-+import os as _os, sys as _sys, sysconfig as _sysconfig
- 
- __version__ = "1.1.0"
- 
 @@ -456,7 +456,7 @@
  if _os.name == "nt":
      pythonapi = PyDLL("python dll", None, _sys.dllhandle)