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/libgeos/0001-CMakeLists.txt-add-BUILD_BENCHMARKS.patch

@@ -0,0 +1,37 @@
+From 16848d6da27140caf922f71a233f96a508fb061e Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 24 Jan 2021 12:38:37 +0100
+Subject: [PATCH] CMakeLists.txt: add BUILD_BENCHMARKS
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/libgeos/geos/pull/395]
+---
+ CMakeLists.txt | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c8b39bac..8ca6b829 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -48,6 +48,7 @@ option(BUILD_SHARED_LIBS "Build GEOS with shared libraries" ON)
+ set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard version to use (default is 11)")
+ 
+ ## GEOS custom variables
++option(BUILD_BENCHMARKS "Build GEOS benchmarks" ON)
+ cmake_dependent_option(GEOS_BUILD_DEVELOPER
+   "Build with compilation flags useful for development" ON
+   "GEOS_BUILD_FROM_GIT" OFF)
+@@ -292,7 +293,9 @@ endif()
+ #-----------------------------------------------------------------------------
+ # Benchmarks
+ #-----------------------------------------------------------------------------
+-add_subdirectory(benchmarks)
++if(BUILD_BENCHMARKS)
++  add_subdirectory(benchmarks)
++endif()
+ 
+ #-----------------------------------------------------------------------------
+ # Utils
+-- 
+2.29.2
+

buildroot/package/libgeos/Config.in

@@ -0,0 +1,15 @@
+config BR2_PACKAGE_LIBGEOS
+	bool "libgeos"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_WCHAR
+	help
+	  GEOS (Geometry Engine - Open Source) is a C++ port of the
+	  JTS Topology Suite (JTS). It aims to contain the complete
+	  functionality of JTS in C++. This includes all the OpenGIS
+	  Simple Features for SQL spatial predicate functions and
+	  spatial operators, as well as specific JTS enhanced functions.
+
+	  https://trac.osgeo.org/geos
+
+comment "libgeos needs a toolchain w/ C++, wchar"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR

buildroot/package/libgeos/libgeos.hash

@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  bd8082cf12f45f27630193c78bdb5a3cba847b81e72b20268356c2a4fc065269  geos-3.9.0.tar.bz2
+sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  COPYING

buildroot/package/libgeos/libgeos.mk

@@ -0,0 +1,28 @@
+################################################################################
+#
+# libgeos
+#
+################################################################################
+
+LIBGEOS_VERSION = 3.9.0
+LIBGEOS_SITE = http://download.osgeo.org/geos
+LIBGEOS_SOURCE = geos-$(LIBGEOS_VERSION).tar.bz2
+LIBGEOS_LICENSE = LGPL-2.1
+LIBGEOS_LICENSE_FILES = COPYING
+LIBGEOS_INSTALL_STAGING = YES
+LIBGEOS_CONFIG_SCRIPTS = geos-config
+LIBGEOS_CONF_OPTS = -DBUILD_BENCHMARKS=OFF
+
+LIBGEOS_CXXFLAGS = $(TARGET_CXXCFLAGS)
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_68485),y)
+LIBGEOS_CXXFLAGS += -O0
+endif
+
+ifeq ($(BR2_arm)$(BR2_armeb),y)
+LIBGEOS_CONF_OPTS += -DDISABLE_GEOS_INLINE=ON
+endif
+
+LIBGEOS_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(LIBGEOS_CXXFLAGS)"
+
+$(eval $(cmake-package))