python: update 3.8.5 -> 3.9.0

Drop 0001-Do-not-hardcode-lib-as-location-for-site-packages-an.patch,
0001-configure.ac-fix-LIBPL.patch and 0001-python3-Do-not-hardcode-lib-for-distutils.patch
as they are all replaced by the new --platlibdir option to ./configure

Rename 0001-Lib-sysconfig.py-fix-another-place-where-lib-is-hard.patch to
0001-Lib-sysconfig.py-use-libdir-values-from-configuratio.patch
and describe the changes better.

License-Update: documentation now dual license under PSF & BSD
(not relevant for the recipe.
(From OE-Core rev: 7347556b18b45c5f9afc2cade565a75c95876914)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3/python-config.patch

@@ -1,4 +1,4 @@
-From 07df0ae0d70cba6d1847fe1c24a71063930bec60 Mon Sep 17 00:00:00 2001
+From 57d073c12e7bede29919117b0141df14015eb27f Mon Sep 17 00:00:00 2001
 From: Tyler Hall <tylerwhall@gmail.com>
 Date: Sun, 4 May 2014 20:06:43 -0400
 Subject: [PATCH] python-config: Revert to using distutils.sysconfig
@@ -21,7 +21,7 @@ Signed-off-by: Tyler Hall <tylerwhall@gmail.com>
  1 file changed, 5 insertions(+), 5 deletions(-)
 
 diff --git a/Misc/python-config.in b/Misc/python-config.in
-index 727c4a8..c702829 100644
+index ebd99da..13e57ae 100644
 --- a/Misc/python-config.in
 +++ b/Misc/python-config.in
 @@ -6,7 +6,7 @@
@@ -37,11 +37,11 @@ index 727c4a8..c702829 100644
  
  for opt in opt_flags:
      if opt == '--prefix':
--        print(sysconfig.get_config_var('prefix'))
+-        print(getvar('prefix'))
 +        print(sysconfig.PREFIX)
  
      elif opt == '--exec-prefix':
--        print(sysconfig.get_config_var('exec_prefix'))
+-        print(getvar('exec_prefix'))
 +        print(sysconfig.EXEC_PREFIX)
  
      elif opt in ('--includes', '--cflags'):