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/systemd/Config.in

@@ -343,6 +343,24 @@ comment "polkit support needs a toolchain with C++, wchar, NPTL, gcc >= 4.9"
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 || \
 		!BR2_USE_WCHAR
 
+config BR2_PACKAGE_SYSTEMD_PORTABLED
+	bool "enable portable services"
+	help
+	  Portable services are systemd services that can be dynamically
+	  attached and detached from the system.
+
+	  These services must come with their own root directory which
+	  they are bound to through an automatically generated drop-in.
+
+	  They also have restrictions applied by the host system in the
+	  form of profiles.
+
+	  This functionality is provided by the system service
+	  systemd-portabled along with the corresponding CLI
+	  portablectl.
+
+	  https://systemd.io/PORTABLE_SERVICES/
+
 config BR2_PACKAGE_SYSTEMD_QUOTACHECK
 	bool "enable quotacheck tools"
 	help

buildroot/package/systemd/systemd.hash

@@ -1,6 +1,6 @@
 # sha256 locally computed
-sha256  3a972d287edd864e0b33321bc74dfe6083d390306461fa7e958895eaa4be6b67  systemd-246.10.tar.gz
+sha256  2869986e219a8dfc96cc0dffac66e0c13bb70a89e16b85a3948876c146cfa3e0  systemd-247.3.tar.gz
 sha256  ab15fd526bd8dd18a9e77ebc139656bf4d33e97fc7238cd11bf60e2b9b8666c6  LICENSE.GPL2
 sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  LICENSE.LGPL2.1
-sha256  b142af99a3d950fb465326d6fd5a49d348523dc0d216682880527264d0a011e9  README
+sha256  6f22d19d35b00f35e0444e0bc9139e6d3bdf7277978f89c4e175e37b18c43f3d  README
 sha256  83bb6bd9ccd2cf5230cb1807ed16258289768dc4d9cb80069a814e04415a1275  tools/chromiumos/LICENSE

buildroot/package/systemd/systemd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SYSTEMD_VERSION = 246.10
+SYSTEMD_VERSION = 247.3
 SYSTEMD_SITE = $(call github,systemd,systemd-stable,v$(SYSTEMD_VERSION))
 SYSTEMD_LICENSE = LGPL-2.1+, GPL-2.0+ (udev), Public Domain (few source files, see README), BSD-3-Clause (tools/chromiumos)
 SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 README tools/chromiumos/LICENSE
@@ -32,8 +32,8 @@ SYSTEMD_CONF_OPTS += \
 	-Dloadkeys-path=/usr/bin/loadkeys \
 	-Dman=false \
 	-Dmount-path=/usr/bin/mount \
+	-Dmode=release \
 	-Dnss-systemd=true \
-	-Dportabled=false \
 	-Dquotacheck-path=/usr/sbin/quotacheck \
 	-Dquotaon-path=/usr/sbin/quotaon \
 	-Drootlibdir='/usr/lib' \
@@ -417,6 +417,12 @@ else
 SYSTEMD_CONF_OPTS += -Dpolkit=false
 endif
 
+ifeq ($(BR2_PACKAGE_SYSTEMD_PORTABLED),y)
+SYSTEMD_CONF_OPTS += -Dportabled=true
+else
+SYSTEMD_CONF_OPTS += -Dportabled=false
+endif
+
 ifeq ($(BR2_PACKAGE_SYSTEMD_NETWORKD),y)
 SYSTEMD_CONF_OPTS += -Dnetworkd=true
 SYSTEMD_NETWORKD_USER = systemd-network -1 systemd-network -1 * - - - systemd Network Management
@@ -643,6 +649,7 @@ HOST_SYSTEMD_CONF_OPTS = \
 	--libdir=lib \
 	--sysconfdir=/etc \
 	--localstatedir=/var \
+	-Dmode=release \
 	-Dutmp=false \
 	-Dhibernate=false \
 	-Dldconfig=false \