Merge pull request #299 from ankgup87/master

[Java] Fix build
RocksDB: Format uint64 using PRIu64 in db_impl.cc

Summary: Use PRIu64 to format uint64 in a portable manner

Test Plan: Run "make all check"

Reviewers: sdong

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D23595