QNX: Fix interrupting when debugging on Windows

This fixes interrupting the inferior process when debugging
BlackBerry applications on Windows. The code was already in use
for pure QNX application, but never BlackBerry.

Change-Id: Icbf8f913475f523ca178250087bfdf3b89086605
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
Reviewed-by: David Schulz <david.schulz@digia.com>