LibCore: Log a more helpful message when Socket::connect() fails

Fixes #1272.

Libraries/LibCore/Socket.cpp

@@ -113,6 +113,8 @@ bool Socket::connect(const SocketAddress& address)
     saddr.sun_family = AF_LOCAL;
     strcpy(saddr.sun_path, address.to_string().characters());
 
+    m_destination_address = address;
+
     return common_connect((const sockaddr*)&saddr, sizeof(saddr));
 }
 
@@ -137,7 +139,9 @@ bool Socket::common_connect(const struct sockaddr* addr, socklen_t addrlen)
             };
             return true;
         }
-        perror("Socket::common_connect: connect");
+        int saved_errno = errno;
+        fprintf(stderr, "Core::Socket: Failed to connect() to %s: %s\n", destination_address().to_string().characters(), strerror(saved_errno));
+        errno = saved_errno;
         return false;
     }
 #ifdef CSOCKET_DEBUG