[CHANGE] we want c++11 by now ... this is already the case in OpenWalnut's core

MyOpenWalnutToolbox/tools/cmake/OpenWalnut.cmake

@@ -228,7 +228,7 @@ FUNCTION( BUILD_SYSTEM_COMPILER )
     IF( CMAKE_HOST_SYSTEM MATCHES "Windows" )
         SET( CMAKE_CXX_FLAGS "-frtti -pedantic -Wall -Wno-long-long -Wextra " CACHE STRING "" FORCE )
     ELSE()
-        SET( CMAKE_CXX_FLAGS "-frtti -pedantic -std=c++98 -Wall -Wno-long-long -Wextra " CACHE STRING "" FORCE )
+        SET( CMAKE_CXX_FLAGS "-frtti -pedantic -std=c++11 -Wall -Wno-long-long -Wextra " CACHE STRING "" FORCE )
     ENDIF()
 
     # Darwin's ld isn't GNU and doesn't like the following