python3-dtc: fix packaging by using setuptools

Inheriting setuptools3-base doesn't actually define any tasks, so commit
1ef6050 to drop distutils3 had the side-effect of not building any code.

Backport a commit from upstream to switch to setuptools, inherit
setuptool3, and change DISTUTILS_SETUP_PATH to SETUPTOOLS_SETUP_PATH.

Signed-off-by: Ross Burton <ross.burton@arm.com>

recipes-kernel/dtc/files/setuptools.patch

@@ -0,0 +1,34 @@
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From c691776ddb26acbd3674722caafacaf7b6e3e807 Mon Sep 17 00:00:00 2001
+From: Rob Herring <robh@kernel.org>
+Date: Wed, 10 Nov 2021 19:11:32 -0600
+Subject: [PATCH] pylibfdt: Use setuptools instead of distutils
+
+The use of setuptools is favored over distutils. setuptools is needed to
+support building Python 'wheels' and for pip support.
+
+Signed-off-by: Rob Herring <robh@kernel.org>
+Message-Id: <20211111011135.2386773-2-robh@kernel.org>
+Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
+---
+ pylibfdt/setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pylibfdt/setup.py b/pylibfdt/setup.py
+index ef40f15..f065a59 100755
+--- a/pylibfdt/setup.py
++++ b/pylibfdt/setup.py
+@@ -10,7 +10,7 @@ Copyright (C) 2017 Google, Inc.
+ Written by Simon Glass <sjg@chromium.org>
+ """
+ 
+-from distutils.core import setup, Extension
++from setuptools import setup, Extension
+ import os
+ import re
+ import sys
+-- 
+2.25.1
+

recipes-kernel/dtc/python3-dtc_1.6.1.bb

@@ -7,6 +7,7 @@ LICENSE = "GPLv2 | BSD-2-Clause"
 DEPENDS = "flex-native bison-native swig-native libyaml dtc"
 
 SRC_URI = "git://git.kernel.org/pub/scm/utils/dtc/dtc.git;branch=master \
+           file://setuptools.patch \
            file://ssize.patch"
 
 UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>\d+(\.\d+)+)"
@@ -17,13 +18,13 @@ SRCREV = "ecaeb97fec013973360e94888a7de645f084345c"
 
 S = "${WORKDIR}/git"
 
-inherit setuptools3-base pkgconfig
+inherit setuptools3 pkgconfig
 
-DISTUTILS_SETUP_PATH = "${S}/pylibfdt"
+SETUPTOOLS_SETUP_PATH = "${S}/pylibfdt"
 
 do_configure:prepend() {
     oe_runmake -C "${S}" version_gen.h
-    mv "${S}/version_gen.h" "${DISTUTILS_SETUP_PATH}/"
+    mv "${S}/version_gen.h" "${SETUPTOOLS_SETUP_PATH}/"
 }
 
 BBCLASSEXTEND = "native nativesdk"