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/quickjs/0001-Makefile-add-optional-link-with-libatomic.patch

@@ -0,0 +1,37 @@
+From 2cf2aa34d5d55a4eedb1aedd4d56d89d24870230 Mon Sep 17 00:00:00 2001
+From: Peter Seiderer <ps.report@gmx.net>
+Date: Sun, 3 Jan 2021 21:11:44 +0100
+Subject: [PATCH] Makefile: allow linking with extra libraries
+
+With some toolchains, it is neede to link with extra libraries, for
+example with -latomic, to fix:
+
+  .../build/quickjs-2020-11-08/quickjs.c:12229: undefined reference to `__atomic_fetch_xor_1'
+
+Fixes:
+  http://autobuild.buildroot.net/results/e0766eef95a2559d51e58d1a81a9c40df84ae509
+
+Signed-off-by: Peter Seiderer <ps.report@gmx.net>
+[yann.morin.1998@free.fr:
+  - make it a generic variable, not tied to -latomic
+]
+Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
+---
+ Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Makefile b/Makefile
+index e6ae827..22ad496 100644
+--- a/Makefile
++++ b/Makefile
+@@ -179,6 +179,7 @@ endif
+ ifndef CONFIG_WIN32
+ LIBS+=-ldl -lpthread
+ endif
++LIBS+=$(EXTRA_LIBS)
+ 
+ $(OBJDIR):
+ 	mkdir -p $(OBJDIR) $(OBJDIR)/examples $(OBJDIR)/tests
+-- 
+2.29.2
+

buildroot/package/quickjs/Config.in

@@ -0,0 +1,19 @@
+config BR2_PACKAGE_QUICKJS
+	bool "quickjs"
+	depends on !BR2_STATIC_LIBS
+	# No way to check for fenv support.
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C11/stdatomic.h
+	depends on BR2_HOST_GCC_AT_LEAST_4_9 # C11/stdatomic.h
+	depends on BR2_USE_MMU # fork()
+	help
+	  QuickJS is a small and embeddable Javascript engine.
+	  It supports the ES2020 specification including modules,
+	  asynchronous generators, proxies and BigInt.
+
+	  https://bellard.org/quickjs/
+
+comment "quickjs needs a glibc or musl toolchain w/ gcc >= 4.9, host gcc >= 4.9, dynamic library"
+	depends on BR2_USE_MMU
+	depends on BR2_STATIC_LIBS || BR2_TOOLCHAIN_USES_UCLIBC || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 || !BR2_HOST_GCC_AT_LEAST_4_9

buildroot/package/quickjs/quickjs.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  2e9d63dab390a95ed365238f21d8e9069187f7ed195782027f0ab311bb64187b  quickjs-2020-11-08.tar.xz

buildroot/package/quickjs/quickjs.mk

@@ -0,0 +1,44 @@
+################################################################################
+#
+# quickjs
+#
+################################################################################
+
+QUICKJS_VERSION = 2020-11-08
+QUICKJS_SOURCE = quickjs-$(QUICKJS_VERSION).tar.xz
+QUICKJS_SITE = https://bellard.org/quickjs
+QUICKJS_LICENSE = MIT
+QUICKJS_INSTALL_STAGING = YES
+
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+QUICKJS_EXTRA_LIBS += -latomic
+endif
+
+define QUICKJS_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) \
+		CROSS_PREFIX="$(TARGET_CROSS)" \
+		EXTRA_LIBS="$(QUICKJS_EXTRA_LIBS)" \
+		all
+endef
+
+define QUICKJS_INSTALL_STAGING_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) \
+		CROSS_PREFIX="$(TARGET_CROSS)" \
+		EXTRA_LIBS="$(QUICKJS_EXTRA_LIBS)" \
+		DESTDIR=$(STAGING_DIR) \
+		STRIP=/bin/true \
+		prefix=/usr \
+		install
+endef
+
+define QUICKJS_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) \
+		CROSS_PREFIX="$(TARGET_CROSS)" \
+		EXTRA_LIBS="$(QUICKJS_EXTRA_LIBS)" \
+		DESTDIR=$(TARGET_DIR) \
+		STRIP=/bin/true \
+		prefix=/usr \
+		install
+endef
+
+$(eval $(generic-package))