Remove C++11 standard flag from CMakeLists.txt

Remove C++11 standard flag from CMakeLists.txt

Author: Tobias-Fischer

patch/ros-noetic-grid-map-ros.patch

@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c20199fe..1af9b8e1 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,8 +1,6 @@
+ cmake_minimum_required(VERSION 3.5.1)
+ project(grid_map_ros)
+ 
+-set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
+-
+ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+ 
+ ## Find catkin macros and libraries