message: linux link issue fix
diff: @@ -274,6 +274,7 @@ libbitcoin_wallet_a_SOURCES = \
  wallet/db.cpp \
  addressbook.cpp \
  crypter.cpp \
  + key_io.cpp \
  swifttx.cpp \
  masternode.cpp \
  masternode-budget.cpp \
  @@ -390,7 +391,6 @@ libbitcoin_common_a_SOURCES = \
  hash.cpp \
  invalid.cpp \
  key.cpp \
  - key_io.cpp \
  keystore.cpp \
  netbase.cpp \
  protocol.cpp \
  