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-pytest-asyncio/Config.in

@@ -0,0 +1,8 @@
+config BR2_PACKAGE_PYTHON_PYTEST_ASYNCIO
+	bool "python-pytest-asyncio"
+	depends on BR2_PACKAGE_PYTHON3 # pytest
+	select BR2_PACKAGE_PYTHON_PYTEST # runtime
+	help
+	  Pytest support for asyncio.
+
+	  https://github.com/pytest-dev/pytest-asyncio

buildroot/package/python-pytest-asyncio/python-pytest-asyncio.hash

@@ -0,0 +1,5 @@
+# md5, sha256 from https://pypi.org/pypi/pytest-asyncio/json
+md5  b63593bc08f445f6e3f14c34128a68ed  pytest-asyncio-0.14.0.tar.gz
+sha256  9882c0c6b24429449f5f969a5158b528f39bde47dc32e85b9f0403965017e700  pytest-asyncio-0.14.0.tar.gz
+# Locally computed sha256 checksums
+sha256  cb5e8e7e5f4a3988e1063c142c60dc2df75605f4c46515e776e3aca6df976e14  LICENSE

buildroot/package/python-pytest-asyncio/python-pytest-asyncio.mk

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-pytest-asyncio
+#
+################################################################################
+
+PYTHON_PYTEST_ASYNCIO_VERSION = 0.14.0
+PYTHON_PYTEST_ASYNCIO_SOURCE = pytest-asyncio-$(PYTHON_PYTEST_ASYNCIO_VERSION).tar.gz
+PYTHON_PYTEST_ASYNCIO_SITE = https://files.pythonhosted.org/packages/65/09/9472d4db0625cf56d40f4e405f955faf6469be00858a273b71332f3fcd1f
+PYTHON_PYTEST_ASYNCIO_SETUP_TYPE = setuptools
+PYTHON_PYTEST_ASYNCIO_LICENSE = Apache-2.0
+PYTHON_PYTEST_ASYNCIO_LICENSE_FILES = LICENSE
+
+$(eval $(python-package))