QNX: Fix shutdown of inferior and inserting breakpoints on Windows

When debugging on a QNX device on Windows, neither
DebugBreakProcess(..) nor "-exec-interrupt" works for interrupting
the inferior process. Neither does sending it a SIGINT signal using
"kill" on the device.

This changes the local gdb process to run under the CtrlC stub on
Windows when debugging on QNX. This enables us to send a Ctrl+C
message to gdb, which interrupts the inferior, and allows us to
insert breakpoints during runtime on Windows.

Change-Id: I4b01fbe81138f3fe7a939a7e64267bac4eb8bf43
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/qnx/qnxruncontrolfactory.cpp

@@ -76,7 +76,7 @@ DebuggerStartParameters createStartParameters(const QnxRunConfiguration *runConf
     params.remoteChannel = device->sshParameters().host + QLatin1String(":-1");
     params.displayName = runConfig->displayName();
     params.remoteSetupNeeded = true;
-    params.closeMode = DetachAtClose;
+    params.closeMode = KillAtClose;
 
     QnxQtVersion *qtVersion =
             dynamic_cast<QnxQtVersion *>(QtSupport::QtKitInformation::qtVersion(k));