Log BerkeleyDB version at startup
Prints the actual version of BerkeleyDB that is linked against, if
wallet support is enabled.
Useful for troubleshooting.
For example:
2014-05-01 07:44:02 Using BerkeleyDB version Berkeley DB 4.8.30: (April 9, 2010) 2014-05-01 07:54:25 Using BerkeleyDB version Berkeley DB 5.1.29: (October 25, 20 11)