Mesh: Remove explicit C++17 requirement

Author: chennes

src/Mod/Mesh/App/CMakeLists.txt

@@ -413,8 +413,6 @@ endif ()
 
 add_library(Mesh SHARED ${Core_SRCS} ${WildMagic4_SRCS} ${Mesh_SRCS})
 target_link_libraries(Mesh ${Mesh_LIBS})
-set_target_properties(Mesh PROPERTIES CXX_STANDARD_REQUIRED ON)
-set_target_properties(Mesh PROPERTIES CXX_STANDARD 17)
 if (FREECAD_WARN_ERROR)
     target_compile_warn_error(Mesh)
 endif()