message: Fix weird leveldb include
diff: #include <leveldb/cache.h>
  #include <leveldb/env.h>
  #include <leveldb/filter_policy.h>
  -// #include <memenv.h>
  -#if defined(__APPLE__) && defined(__MACH__)
  -#include <helpers/memenv/memenv.h> // qtum
  -#else
  -#include <leveldb/helpers/memenv.h> // qtum
  -#endif
  +#include <memenv.h>
  #include <stdint.h>
  static leveldb::Options GetOptions(size_t nCacheSize)
  