pcaprub: add a respond_to? in the capture mixin to ensure latest version

git-svn-id: file:///home/svn/framework3/trunk@12565 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/core/exploit/capture.rb

@@ -373,9 +373,13 @@ module Exploit::Capture
 	end
 
 	def check_pcaprub_loaded
-		unless @pcaprub_loaded
+		if not @pcaprub_loaded
 			print_status("The Pcaprub module is not available: #{@pcaprub_error}")
 			raise RuntimeError, "Pcaprub not available"
+		#Those methods have been added later
+		elsif (not Pcap.respond_to? "lookupaddrs")
+			print_status("The Pcaprub module is not up-to-date")
+			raise RuntimeError, "The Pcaprub module is missing some functions"
 		else
 			true
 		end