[jnc_io_base] simplify generation of stdio pipe names
[jnc_io_base] simplify generation of stdio pipe names

this also gets rid of InterlockedCompareExchange64 dependency -- which is missing on XP-x86

vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy