Bump Buildroot to 2021.02-rc3 (#1260)

* Rebase patches to Buildroot 2021.02-rc3

* Update Buildroot to 2021.02-rc3

* Declare Kernel headers to be Linux version 5.10 (since they are, and new Buildroot knows about 5.10)

buildroot/package/python-protobuf/0001-python-setup.py-remove-unneeded-wheel-dependency.patch

@@ -1,41 +0,0 @@
-From 9f8a6ed7fda9abf474ce886dddf3ab5abc0ead0b Mon Sep 17 00:00:00 2001
-From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
-Date: Sun, 20 Sep 2020 10:52:32 +0200
-Subject: [PATCH] python/setup.py: remove unneeded wheel dependency
-
-wheel is required since version 3.13.0 and
-https://github.com/protocolbuffers/protobuf/commit/ff92cee10bcae7533b573368f448e782fbd43f39
-
-This will result in the following build failure when cross-compiling:
-
-Download error on https://pypi.org/simple/wheel/: unknown url type: https -- Some packages may not be found!
-Couldn't find index page for 'wheel' (maybe misspelled?)
-Download error on https://pypi.org/simple/: unknown url type: https -- Some packages may not be found!
-No local packages or working download links found for wheel
-
-Remove wheel requirement from setup.py as it is only needed by
-release.sh, not by setup.py
-
-Fixes:
- - http://autobuild.buildroot.org/results/371c686a10d6870933011b46d36b1879d29046b9
-
-Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
----
- python/setup.py | 1 -
- 1 file changed, 1 deletion(-)
-
-diff --git a/python/setup.py b/python/setup.py
-index b44e88b2f..39eb18d4b 100755
---- a/python/setup.py
-+++ b/python/setup.py
-@@ -293,7 +293,6 @@ if __name__ == '__main__':
-           'build_py': build_py,
-           'test_conformance': test_conformance,
-       },
--      setup_requires = ['wheel'],
-       install_requires=install_requires,
-       ext_modules=ext_module_list,
-   )
--- 
-2.28.0
-

buildroot/package/python-protobuf/python-protobuf.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  9c4d2ad449d27da5ac1db1ad5ecc4a642dedd6bbe59219d61d7b655b6b12be89  protobuf-python-3.13.0.tar.gz
+sha256  969019c5fd9c1345f0b34afa06ab2664c1441d159d5ae87ded5fa01d79f028c1  protobuf-python-3.14.0.tar.gz
 sha256  6e5e117324afd944dcf67f36cf329843bc1a92229a8cd9bb573d7a83130fea7d  LICENSE