Apr-scan has a segmentation fault

[Antti Savolainen]

The default arp-scan package version 1.9 crashes on startup. Currently on
Xubuntu 17.10. It's apparently fixed in the later versions but the patch
should be cherry picked for this release.

Here's a dump in case you have use for it

(gdb) bt
#0  0x000055555555e940 in get_hardware_address (if_name=0x7ffff7dd44e0
"enp0s31f6",
    hw_address=0x7fffffffdcca "\225\367\377\177") at
link-packet-socket.c:127
#1  0x00005555555565f5 in main (argc=1, argv=0x7fffffffdfd8) at
arp-scan.c:165
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