[openwrt/openwrt] prereq-build: require python3-distutils

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/5bfb9c30a1a3199596dcf07cf64dea7df92a7237

commit 5bfb9c30a1a3199596dcf07cf64dea7df92a7237
Author: Andre Heider <a.heider at gmail.com>
AuthorDate: Tue Aug 10 12:22:17 2021 +0200

    prereq-build: require python3-distutils
    
    Debian and Ubuntu ship a python3-minimal package which does not include
    the distutils module. This is not supported by upstream and can be
    considered a broken python distribution.
    
    In practice, many scripts depend on said module, and this is a reoccuring
    pain point for building various OpenWrt packages.
    
    Require and check for said module, enough time has been wasted on this.
    
    A list of just the most recent issues:
    https://github.com/openwrt/packages/pull/16304
    https://github.com/openwrt/packages/pull/16027
    https://github.com/openwrt/packages/pull/15443
    https://github.com/openwrt/packages/pull/14394
    https://github.com/openwrt/packages/pull/12909
    https://github.com/openwrt/packages/issues/12443
    https://github.com/openwrt/packages/pull/11035
    https://github.com/openwrt/packages/issues/10993
    
    Signed-off-by: Andre Heider <a.heider at gmail.com>
    (cherry picked from commit 60af8d753343691c4a647bfc7c51ef6eb92df9f2)
---
 include/prereq-build.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index cb3dcc51e3..538aee58fe 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -168,6 +168,10 @@ $(eval $(call SetupHostCommand,python3,Please install Python >= 3.5, \
 	python3.5 -V 2>&1 | grep 'Python 3', \
 	python3 -V 2>&1 | grep -E 'Python 3\.[5-9]\.?'))
 
+$(eval $(call TestHostCommand,python3-distutils, \
+	Please install the Python3 distutils module, \
+	$(STAGING_DIR_HOST)/bin/python3 -c 'import distutils'))
+
 $(eval $(call SetupHostCommand,git,Please install Git (git-core) >= 1.7.12.2, \
 	git --exec-path | xargs -I % -- grep -q -- --recursive %/git-submodule))