Bump libtool version for 0.2.1
Bump libtool version for 0.2.1

Geremia/libblkmaker,Geremia/libblkmaker,RibbitFROG/libblkmaker,bitcoin/libblkmaker,arnuschky/primecoin-libblkmaker,bitcoin/libblkmaker,RibbitFROG/libblkmaker,arnuschky/primecoin-libblkmaker