Do not link c++ library with clang 20

Author: linev

cmake/modules/DabcConfiguration.cmake

@@ -71,7 +71,9 @@ if(NOT APPLE)
   find_library(DABC_rt_LIBRARY rt)
   if(CMAKE_CXX_COMPILER_ID STREQUAL Clang)
     find_library(DABC_m_LIBRARY m)
-    find_library(DABC_cpp_LIBRARY "c++")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 20.0)
+      find_library(DABC_cpp_LIBRARY "c++")
+    endif()
   endif()
 endif()