new macro __ZRT__ support instead of __native_client__
better __ZRT_HOST support
tar x64 support
for __ZRT_SO avoid using malloc woth logbase setup
renamed symbols in ptrace to avoid conflicts during linkage, for __ZRT_SO.
Added new generic dirent engine implem provided as separate file

Old one implementation was removed. New implementation also
supports __ZRT_SO
inmemory fs unavailable for __ZRT_SO
fixed misusing of stdarg
fixes for __ZRT_SO: configure pth, do not install not needed libraries: lfs, lcontext..
__ZRT_SO support - autotests disabled, removed mem_mount_wrapper src file
fixed conflict after merging