Add create_function as a disallowed function call (#261)

I doubt this is still used much, since it was removed in PHP 8.0
But if its present you probably want to get rid of it

disallowed-dangerous-calls.neon

@@ -9,6 +9,10 @@ parameters:
 		-
 			function: 'eval()'
 			message: 'eval is evil, please write more code and do not use eval()'
+		-
+			function: 'create_function()'
+			message: 'the function is about as evil as using eval()'
+			errorTip: 'create_function() has been deprecated as of PHP 7.2, and removed as of PHP 8.0'
 		-
 			function: 'extract()'
 			message: 'do not use extract() and especially not on untrusted data'