qt terminal for gnuplot on cygwin workaround)

[Tatsuro MATSUOKA]

A workaround for qt enables qt termnal on Cygwin is shown by  Enrico Forestieri 
https://sourceforge.net/p/gnuplot/mailman/gnuplot-beta/thread/16092.81463.qm@web103110.mail.kks.yahoo.co.jp/

--- a/qtbase-everywhere-src-5.10.1/src/network/socket/qlocalsocket_unix.cpp
+++ b/qtbase-everywhere-src-5.10.1/src/network/socket/qlocalsocket_unix.cpp
@@ -239,7 +239,7 @@ void QLocalSocket::connectToServer(OpenM
     }

     // create the socket
-    if (-1 == (d->connectingSocket = qt_safe_socket(PF_UNIX, SOCK_STREAM, 0, 
O_NONBLOCK))) {
+    if (-1 == (d->connectingSocket = qt_safe_socket(PF_UNIX, SOCK_STREAM, 
0))) {
         d->errorOccurred(UnsupportedSocketOperationError,
                        
QLatin1String("QLocalSocket::connectToServer"));
         return;

I myself generate library libQt5Network as libQt5Network-gnuplot and used gnuplot  build.
I dp not know that the modification avove is valid but enables me to use qt terminal on cygwin.

Tatsuro