Fix passing of kernel parameters

Broken in 9ee30cd9b51c46cea7193993d006bb4301588001.  Reported by Arvin
Moezzi.
dropbox: Update to 2.4.7.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Adding libnl 3.2.19 to use instead of the latest with ntrack

ntrack has a bug about fresher libnl compatilbility. There are no
updates since September.
Re-instate the "hydraPlatforms = []" setting accidentally overwritten earlier.