Summary:
Looks like std::snprintf is not available on all platforms (e.g. MSVC 2010). Change it back to snprintf, where we have a macro in port.h to workaround compatibility.
Closes https://github.com/facebook/rocksdb/pull/2308
Differential Revision: D5070988
Pulled By: yiwu-arbug
fbshipit-source-id: bedfc1660bab0431c583ad434b7e68265e1211b1