removed unnecessary code and reenable warnings

CMakeLists.txt

@@ -655,24 +655,6 @@ endif()
 #############################################################################################################################
 set ( Boost_NO_BOOST_CMAKE ON)
 
-# 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" "1.71.0" "1.72.0" "1.73.0" "1.74.0")
-
-# if you defined BOOST_ROOT or BOOST_BASE in your environment use it here to find boost too
-if ( NOT BOOST_ROOT )
-   foreach ( var  BOOST_ROOT  BOOST_BASE )
-      if ( NOT "$ENV{${var}}" STREQUAL "" )
-         message ( STATUS "Use environment boost directory: $ENV{${var}}" )
-         set ( BOOST_ROOT $ENV{${var}} CACHE INTERNAL "")
-         break ( )
-      endif ( )
-   endforeach ( )
-endif ( )
-
 find_package ( Boost )
 
 if ( Boost_FOUND )