Fix qmake build

Ammends commit 770d87709e.

Change-Id: I5dc0d4ca821a7da8c8a14a56ce4f885176314be0
Reviewed-by: hjk <hjk@qt.io>

tests/manual/process/mainwindow.cpp

@@ -57,6 +57,7 @@ void MainWindow::test()
     qDebug() << "Async: " << cmd << args;
     process.setStdOutCallback([this](const QString &s) { append(s); });
     process.setStdErrCallback([this](const QString &s) { append(s); });
-    process.run({cmd, args});
+    process.setCommand({cmd, args});
+    process.runBlocking();
     qDebug() << process;
 }