Remove dead code branches (#6875)

include/server/connection.hpp

@@ -14,18 +14,6 @@
 #include <memory>
 #include <vector>
 
-// workaround for incomplete std::shared_ptr compatibility in old boost versions
-#if BOOST_VERSION < 105300 || defined BOOST_NO_CXX11_SMART_PTR
-
-namespace boost
-{
-template <class T> const T *get_pointer(std::shared_ptr<T> const &p) { return p.get(); }
-
-template <class T> T *get_pointer(std::shared_ptr<T> &p) { return p.get(); }
-} // namespace boost
-
-#endif
-
 namespace osrm::server
 {