Missing dependency check for iw

[mryel00]

First of all, thank you for the script, this made the setup pretty easy.
I was confused when I run the nm script and no interface was shown to select. After looking at the code, it seems like you are using iw to filter the interfaces at /sys/class/net/ to only show wireless ones:

easyroam-linux/easyroam_nm.sh

Lines 49 to 53 in 1272f27

	for iface in $(ls /sys/class/net/); do
	if iw dev "$iface" info &>/dev/null; then
	interfaces+=("$iface")
	fi
	done

On NixOS I obviously didn't have it installed by default, therefore it didn't show me any interface.
I recommend to add check_dependency "iw" to the dependency checks.