s/std::snprintf/snprintf
s/std::snprintf/snprintf

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

bbiao/rocksdb,bbiao/rocksdb,bbiao/rocksdb,bbiao/rocksdb,vmx/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,vmx/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,vmx/rocksdb,Andymic/rocksdb,vmx/rocksdb,bbiao/rocksdb,Andymic/rocksdb,bbiao/rocksdb,Andymic/rocksdb,Andymic/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,Andymic/rocksdb,SunguckLee/RocksDB,Andymic/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,Andymic/rocksdb,Andymic/rocksdb,vmx/rocksdb,SunguckLee/RocksDB