mrouted: convet to gentargets and bump to version 3.9.4

mrouted is once again being actively developed.
See http://github.com/troglobit/mrouted



[ Thomas: bump to 3.9.4, patches updated, prefix fix. ]

Signed-off-by: Martin Banky <Martin.Banky@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>