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/openssh/openssh.mk

@@ -5,6 +5,8 @@
 ################################################################################
 
 OPENSSH_VERSION = 8.3p1
+OPENSSH_CPE_ID_VERSION = 8.3
+OPENSSH_CPE_ID_UPDATE = p1
 OPENSSH_SITE = http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable
 OPENSSH_LICENSE = BSD-3-Clause, BSD-2-Clause, Public Domain
 OPENSSH_LICENSE_FILES = LICENCE
@@ -12,6 +14,7 @@ OPENSSH_CONF_ENV = \
 	LD="$(TARGET_CC)" \
 	LDFLAGS="$(TARGET_CFLAGS)" \
 	LIBS=`$(PKG_CONFIG_HOST_BINARY) --libs openssl`
+OPENSSH_CPE_ID_VENDOR = openbsd
 OPENSSH_CONF_OPTS = \
 	--sysconfdir=/etc/ssh \
 	--with-default-path=$(BR2_SYSTEM_DEFAULT_PATH) \