wasm: fix QTcpSocket error code when url doesn't exist

::connect on wasm seems to be returning 0 in the instance that the
server url does not exist.
So we ignore that and look at errno, which returns ENOENT
which makes no sense here.

Fixes: QTBUG-132191
Change-Id: I2ff6642dd836324e1af6c288c53880de028ce158
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
(cherry picked from commit 1a8c8ffb0c45644c05ea1474df48bfdeea563524)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Reviewed-by: Lorn Potter <lorn.potter@qt.io>

src/network/socket/qnativesocketengine_unix.cpp

@@ -401,6 +401,7 @@ bool QNativeSocketEnginePrivate::nativeConnect(const QHostAddress &addr, quint16
             break;
         case ECONNREFUSED:
         case EINVAL:
+        case ENOENT:
             setError(QAbstractSocket::ConnectionRefusedError, ConnectionRefusedErrorString);
             socketState = QAbstractSocket::UnconnectedState;
             break;

src/network/socket/qnet_unix_p.h

@@ -109,6 +109,11 @@ static inline int qt_safe_connect(int sockfd, const struct sockaddr *addr, QT_SO
     int ret;
     // Solaris e.g. expects a non-const 2nd parameter
     QT_EINTR_LOOP(ret, QT_SOCKET_CONNECT(sockfd, const_cast<struct sockaddr *>(addr), addrlen));
+#ifdef Q_OS_WASM
+// ::connect on wasm returns 0 when it shouldn't so use errno instead
+   if (errno != 0)
+       ret = -1;
+#endif
     return ret;
 }
 #undef QT_SOCKET_CONNECT