I don't have acces to bash to do upgrade manually so I downloaded that libstdc++.so.6.0.25 version from network (it was hard to find working .dll) and replaced `libstdc++.so.6` on server with my new .dll.
Now it works
Code:
[ 8] Custom Entity Data RUN - customentdata_amxx_i386.so v1.0.3 pl3 ANY ANY
Thanks for help ;)