It was decided to update some libraries, which are used for Windows builds

libminiupnpc 1.6 -> 1.8
openssl 1.0.1c -> 1.0.1f
libdb 4.8.30 -> 5.3.21

New builds are backward-compatible, but wallet.dat becomes unreadable for old builds once it was opened by new client.

Testing builds for compatibility checking: [AMD64  | i686]