Fix two Wunused-private-field warnings.

src/ripple/app/main/LocalCredentials.cpp

@@ -22,10 +22,7 @@
 
 namespace ripple {
 
-LocalCredentials::LocalCredentials ()
-    : mLedger (0)
-{
-}
+LocalCredentials::LocalCredentials () = default;
 
 void LocalCredentials::start ()
 {

src/ripple/app/main/LocalCredentials.h

@@ -60,8 +60,6 @@ private:
 
     RippleAddress mNodePublicKey;
     RippleAddress mNodePrivateKey;
-
-    LedgerIndex mLedger; // ledger we last synched to
 };
 
 } // ripple

src/ripple/app/transactors/CreateOffer.cpp

@@ -31,7 +31,9 @@ class CreateOffer
 {
 private:
     // What kind of offer we are placing
+#if RIPPLE_ENABLE_AUTOBRIDGING
     bool autobridging_;
+#endif
 
     /** Determine if we are authorized to hold the asset we want to get */
     TER
@@ -132,7 +134,9 @@ public:
             params,
             engine,
             deprecatedLogs().journal("CreateOffer"))
+#if RIPPLE_ENABLE_AUTOBRIDGING
         , autobridging_ (autobridging)
+#endif
     {
 
     }