aircrack-ng: mention script dependencies in the help text

aircrack-ng: mention script dependencies in the help text

aircrack-ng has some scripts (airmon-ng, airmon-zc) that use external
tools for their functionality. We don't select the corresponding
packages because some of the other aircrack-ng tools don't need these
at all.

Still, the user should be informed of this. So update the help text to
refer to all packages used by the scripts:
- ethtool
- iw
- rfkill
- util-linux for lspci and lsusb (script uses options not available in
  busybox)
- wireless_tools for iwconfig and iwpriv

See also bug #8936

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: lipkegu@gmail.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>