walletdb: Move BDB specific things into bdb.{cpp/h}

Leave wallet/db.{cpp/h} for generic WalletDatabase stuff. The BDB
specific stuff goes into bdb.{cpp/h}

Author: achow101

src/Makefile.am

@@ -240,6 +240,7 @@ BITCOIN_CORE_H = \
   versionbits.h \
   versionbitsinfo.h \
   walletinitinterface.h \
+  wallet/bdb.h \
   wallet/coincontrol.h \
   wallet/context.h \
   wallet/crypter.h \
@@ -350,6 +351,7 @@ libbitcoin_wallet_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
 libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_wallet_a_SOURCES = \
   interfaces/wallet.cpp \
+  wallet/bdb.cpp \
   wallet/coincontrol.cpp \
   wallet/context.cpp \
   wallet/crypter.cpp \

src/qt/rpcconsole.cpp

@@ -24,6 +24,7 @@
 #include <univalue.h>
 
 #ifdef ENABLE_WALLET
+#include <wallet/bdb.h>
 #include <wallet/db.h>
 #include <wallet/wallet.h>
 #endif