[KWo]

podbot_mm_amd64.so file has to be loaded on 64bit linux systems only if installed there CS is also 64 bit version. From that what I know Valve has stopped supporting steam/cs in 64bit version. In other hand - users clearly said at other forums there is no any advantage in the performance to use 64bit version over 32 on 64 bits systems.
If somebody is still using some older CS version and if it is there 64bits CS installation on 64 bit linux OS - for those podbot_mm_amd64.so file is (which I'm just compiling, but I cannot provide any support for it - I don't have any PC box with that 64bit linux OS and 64 bit CS). But - if You don't want to have any troubles - install - even on Your 64 bit linux OS - 32 bit version of CS and load podbot_mm_i386.so file - and with that one - at least with latest CS1.6/CZERO - there is no any problem (many users are using it - also at other boards) since the time it's statically linked with libstdc++6.