Utils: Add a synchronous property to QtcProcess interface

Use it to avoid IDevice interface clutter.

Change-Id: I4a04f04e2c343593d937a402060e56ef94fcabf1
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/qtcprocess.cpp

@@ -763,6 +763,9 @@ void QtcProcess::start()
         }
         QProcess::start(command, arguments.toUnixArgs());
     }
+
+    if (m_synchronous)
+        QProcess::waitForFinished();
 }
 
 #ifdef Q_OS_WIN
@@ -1262,6 +1265,16 @@ void QtcProcess::setupChildProcess_impl()
 #endif
 }
 
+bool QtcProcess::isSynchronous() const
+{
+    return m_synchronous;
+}
+
+void QtcProcess::setSynchronous(bool on)
+{
+    m_synchronous = on;
+}
+
 bool QtcProcess::ArgIterator::next()
 {
     // We delay the setting of m_prev so we can still delete the last argument