updated build system

cmake/libraries/boost.cmake

@@ -99,7 +99,6 @@ if(PROJECT_ENABLE_BOOST)
         --prefix=${PROJECT_EXTERNAL_BUILD_ROOT}
         address-model=64
         architecture=${BOOST_ARCH}
-        cxxstd=20
         cxxstd-dialect=gnu
         cxxflags=-std=gnu++${CMAKE_CXX_STANDARD}
         cxxstd=${CMAKE_CXX_STANDARD}