Squashed 'src/leveldb/' changes from 64052c76c5..524b7e36a8
Squashed 'src/leveldb/' changes from 64052c76c5..524b7e36a8

524b7e36a8 Merge #19: Increase maximum read-only mmap()s used from 1000 to 4096 on 64-bit systems
4874cb8d3e Increase maximum number of read-only mmap()s used from 1000 to 4096 on 64 bit systems.

git-subtree-dir: src/leveldb
git-subtree-split: 524b7e36a8e3bce6fcbcd1b5df09024283f325ba

peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin