QTcpSocket bind() auto test: return instead of QSKIP

... because SkipSingle was removed in Qt5, and a QSKIP would result in
the SSL tests not being executed.
This can be reverted once QTBUG-29972 is fixed.

Change-Id: I3663ee52f00c3f4391ce78cf63bd444656d79cb3
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>

tests/auto/network/socket/qtcpsocket/tst_qtcpsocket.cpp

@@ -513,7 +513,7 @@ void tst_QTcpSocket::bind()
 {
     QFETCH_GLOBAL(bool, setProxy);
     if (setProxy)
-        QSKIP("QTBUG-22964");
+        return; // QTBUG-22964 for proxies, QTBUG-29972 for QSKIP
     QFETCH(QString, stringAddr);
     QFETCH(bool, successExpected);
     QFETCH(QString, stringExpectedLocalAddress);