Utils: Join SynchronousProcess::run and runBlocking implementations

Make functionality dependent on an (intentionally ugly)
setProcessUserEventWhileRunning call.

Also, back-paddle a bit on API combination of QtcProcess and
SynchronousPrceoss for now and prevent the QtcProcess-and-
runBlocking and SynchronousProcess-and-start combinations.

Goal is still to have all in QtcProcess in the end, but this
may take a while.

Change-Id: Ic146ec5db0ab8dc9613e5b2af5f4dc90bc7465ca
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/android/androiddeployqtstep.cpp

@@ -483,7 +483,8 @@ void AndroidDeployQtStep::runCommand(const CommandLine &command)
                    OutputFormat::NormalMessage);
 
     buildProc.setCommand(command);
-    buildProc.run();
+    buildProc.setProcessUserEventWhileRunning();
+    buildProc.runBlocking();
     if (buildProc.result() != QtcProcess::Finished || buildProc.exitCode() != 0) {
         const QString error = buildProc.exitMessage();
         emit addOutput(error, OutputFormat::ErrorMessage);