o [NSE] Added checks for missing OpenSSL to MySQL scripts and library [Patrik]

scripts/mysql-variables.nse

@@ -40,6 +40,16 @@ dependencies = {"mysql-brute", "mysql-empty-password"}
 -- Version 0.1
 -- Created 01/23/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
 
+-- ripped from ssh-hostkey.nse
+-- openssl is required for this script
+if not pcall(require,"openssl") then
+	portrule = function() return false end
+  	action = function() end
+  	stdnse.print_debug( 3, "Skipping %s script because OpenSSL is missing.", filename )
+  	return;
+end
+
+
 portrule = shortport.port_or_service(3306, "mysql")
 
 action = function( host, port )