moveonly: move SetSocketNonBlocking() from netbase to util/sock

To be converted to a method of the `Sock` class.

src/netbase.cpp

@@ -717,21 +717,6 @@ bool LookupSubNet(const std::string& subnet_str, CSubNet& subnet_out)
     return false;
 }
 
-bool SetSocketNonBlocking(const SOCKET& hSocket)
-{
-#ifdef WIN32
-    u_long nOne = 1;
-    if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
-#else
-    int fFlags = fcntl(hSocket, F_GETFL, 0);
-    if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
-#endif
-        return false;
-    }
-
-    return true;
-}
-
 void InterruptSocks5(bool interrupt)
 {
     interruptSocks5Recv = interrupt;

src/netbase.h

@@ -221,8 +221,6 @@ bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nT
  */
 bool ConnectThroughProxy(const Proxy& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed);
 
-/** Enable non-blocking mode for a socket */
-bool SetSocketNonBlocking(const SOCKET& hSocket);
 void InterruptSocks5(bool interrupt);
 
 /**

src/util/sock.cpp

@@ -117,6 +117,21 @@ int Sock::GetSockName(sockaddr* name, socklen_t* name_len) const
     return getsockname(m_socket, name, name_len);
 }
 
+bool SetSocketNonBlocking(const SOCKET& hSocket)
+{
+#ifdef WIN32
+    u_long nOne = 1;
+    if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
+#else
+    int fFlags = fcntl(hSocket, F_GETFL, 0);
+    if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
+#endif
+        return false;
+    }
+
+    return true;
+}
+
 bool Sock::IsSelectable() const
 {
 #if defined(USE_POLL) || defined(WIN32)

src/util/sock.h

@@ -273,6 +273,9 @@ private:
     void Close();
 };
 
+/** Enable non-blocking mode for a socket */
+bool SetSocketNonBlocking(const SOCKET& hSocket);
+
 /** Return readable error string for a network error code */
 std::string NetworkErrorString(int err);