No need for workaround for boost before version 1.47 (#7787)

CGAL requires boost 1.66 or higher since CGAL-5.6.

Classification/include/CGAL/Classification/ETHZ/internal/random-forest/common-libraries.hpp

@@ -34,11 +34,7 @@
 #include <boost/bind/bind.hpp>
 #include <boost/ptr_container/ptr_vector.hpp>
 #include <boost/random/mersenne_twister.hpp>
-#if BOOST_VERSION >= 104700
-#  include <boost/random/uniform_int_distribution.hpp>
-#else
-#  include <boost/random/uniform_int.hpp>
-#endif
+#include <boost/random/uniform_int_distribution.hpp>
 #include <boost/random/uniform_01.hpp>
 #include <boost/random/normal_distribution.hpp>
 #if defined(CGAL_LINKED_WITH_BOOST_IOSTREAMS) && defined(CGAL_LINKED_WITH_BOOST_SERIALIZATION)
@@ -65,17 +61,10 @@ inline void init_feature_class_data(FeatureClassDataFloat& /*data*/, int /*n_cla
 }
 typedef std::unordered_set<int> FeatureSet;
 
-#if BOOST_VERSION >= 104700
 typedef boost::random::uniform_int_distribution<> UniformIntDist;
 typedef boost::random::normal_distribution<> NormalDist;
 typedef boost::random::mt19937 RandomGen;
 typedef boost::random::uniform_01<> UnitDist;
-#else
-typedef boost::uniform_int<> UniformIntDist;
-typedef boost::normal_distribution<> NormalDist;
-typedef boost::uniform_01<> UnitDist;
-typedef boost::mt19937 RandomGen;
-#endif
 
 struct ForestParams {
     size_t n_classes;