add C++ mangling c_long and c_ulong
fix Issue 13481 - bug with inferring attributes from built-in properties
Merge pull request #4001 from 9rnsr/fix13481

Issue 13481 - bug with inferring attributes from built-in properties
Merge pull request #3997 from WalterBright/c_long

add C++ mangling c_long and c_ulong