QNX: Fixed killing processes on QNX and BlackBerry

The commands were mixed up in previous commit, we have to use
pidin on BlackBerry, at least the older ones.

Change-Id: Ibff1f386c6570814a4bccfef5404e60854222f24
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>