MP option ignored

The compilation option MP, available since 2005 is not taken into account:

msvc_objectmodel.cpp,649: added:

}
else if (second == 'P')
{
if (config->CompilerVersion >= NET2005)
AdditionalOptions += option;
else
warn_msg(WarnLogic, "/MP option only for .NET >= 2005,
ignoring.");
break;
}