add Boost 1.71 as supported version

CMakeLists.txt

@@ -651,13 +651,6 @@ if ( WALBERLA_BUILD_WITH_PYTHON AND WALBERLA_CXX_COMPILER_IS_MSVC )
     list( APPEND waLBerla_REQUIRED_BOOST_COMPONENTS ${PYTHON_REQUIRED_LIB} )
 endif()
 
-# This variable is necessary, if the CMAKE version used is not aware of a more recent boost version (keep this up to date!)
-set ( Boost_ADDITIONAL_VERSIONS
-      "1.45" "1.45.0" "1.46" "1.46.0" "1.46.1" "1.47" "1.47.0" "1.48" "1.48.0" "1.49" "1.49.0"
-      "1.50" "1.50.0" "1.51" "1.51.0" "1.52" "1.52.0" "1.53" "1.53.0" "1.54" "1.54.0" "1.55" "1.55.0"
-      "1.56" "1.56.0" "1.57" "1.57.0" "1.58" "1.58.0" "1.59" "1.59.0" "1.60" "1.60.0" "1.61" "1.61.0" "1.62" "1.62.0" "1.63" "1.63.0"
-      "1.64.0" "1.65.0" "1.65.1" "1.66.0" "1.67.0" "1.68.0" "1.69.0" "1.70.0" )
-
 set ( Boost_USE_STATIC_LIBS    OFF CACHE BOOL "Use boost static libraries" )
 set ( Boost_USE_MULTITHREADED  OFF CACHE BOOL "Use boost multithreaded libraries" )
 set ( Boost_USE_STATIC_RUNTIME OFF CACHE BOOL "Use boost libraries statically linked to runtime libs" )

cmake/FindBoost.cmake

@@ -892,7 +892,7 @@ function(_Boost_COMPONENT_DEPENDENCIES component _ret)
       set(_Boost_WAVE_DEPENDENCIES filesystem serialization thread chrono date_time atomic)
       set(_Boost_WSERIALIZATION_DEPENDENCIES serialization)
     endif()
-    if(NOT Boost_VERSION VERSION_LESS 107100)
+    if(NOT Boost_VERSION VERSION_LESS 107200)
       message(WARNING "New Boost version may have incorrect or missing dependencies and imported targets")
     endif()
   endif()
@@ -1140,7 +1140,7 @@ else()
   # _Boost_COMPONENT_HEADERS.  See the instructions at the top of
   # _Boost_COMPONENT_DEPENDENCIES.
   set(_Boost_KNOWN_VERSIONS ${Boost_ADDITIONAL_VERSIONS}
-    "1.70.0" "1.70" "1.69.0" "1.69"
+    "1.71.0" "1.70.0" "1.70" "1.69.0" "1.69"
     "1.68.0" "1.68" "1.67.0" "1.67" "1.66.0" "1.66" "1.65.1" "1.65.0" "1.65"
     "1.64.0" "1.64" "1.63.0" "1.63" "1.62.0" "1.62" "1.61.0" "1.61" "1.60.0" "1.60"
     "1.59.0" "1.59" "1.58.0" "1.58" "1.57.0" "1.57" "1.56.0" "1.56" "1.55.0" "1.55"