Replaced deprecated boost::filesystem::copy_option

src/usages_clang.cpp

@@ -737,7 +737,7 @@ void Usages::Clang::write_cache(const boost::filesystem::path &path, const Clang
       stream.close();
       boost::filesystem::rename(tmp_file, full_cache_path, ec);
       if(ec) {
-        boost::filesystem::copy_file(tmp_file, full_cache_path, boost::filesystem::copy_option::overwrite_if_exists);
+        boost::filesystem::copy_file(tmp_file, full_cache_path, boost::filesystem::copy_options::overwrite_existing);
         boost::filesystem::remove(tmp_file, ec);
       }
     }