Add checks for nmap.address_family == "inet" to scripts that require

that. Patch by Henri Doreau.

scripts/qscan.nse

@@ -53,6 +53,7 @@ require 'stdnse'
 require 'bin'
 require 'packet'
 require 'tab'
+require 'nmap'
 
 -- defaults
 local DELAY = 0.200
@@ -378,6 +379,10 @@ hostrule = function(host)
 		end
 		return false
 	end
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
 	if not host.interface then
 		return false
 	end