Changes to upgrade bdb to 6.2.23

Closes #1255

configure.ac

@@ -263,9 +263,9 @@ case $host in
          dnl add default macports paths
          CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
          LIBS="$LIBS -L/opt/local/lib"
-         if test -d /opt/local/include/db48; then
-           CPPFLAGS="$CPPFLAGS -I/opt/local/include/db48"
-           LIBS="$LIBS -L/opt/local/lib/db48"
+         if test -d /opt/local/include/db62; then
+           CPPFLAGS="$CPPFLAGS -I/opt/local/include/db62"
+           LIBS="$LIBS -L/opt/local/lib/db62"
          fi
        fi
 
@@ -512,7 +512,7 @@ AC_SUBST(LIBMEMENV)
 
 if test x$enable_wallet != xno; then
     dnl Check for libdb_cxx only if wallet enabled
-    BITCOIN_FIND_BDB48
+    BITCOIN_FIND_BDB62
 fi
 
 dnl Check for libminiupnpc (optional)