Move GetLocal() declaration from header to implementation

src/net.cpp

@@ -146,7 +146,7 @@ uint16_t GetListenPort()
 }
 
 // find 'best' local address for a particular peer
-bool GetLocal(CService& addr, const CNode& peer)
+[[nodiscard]] static bool GetLocal(CService& addr, const CNode& peer)
 {
     if (!fListen)
         return false;

src/net.h

@@ -163,7 +163,6 @@ bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
 void RemoveLocal(const CService& addr);
 bool SeenLocal(const CService& addr);
 bool IsLocal(const CService& addr);
-bool GetLocal(CService& addr, const CNode& peer);
 CService GetLocalAddress(const CNode& peer);
 CService MaybeFlipIPv6toCJDNS(const CService& service);