Receive: only avoid overriding own methods

Fix: #1530

My understanding of this `next if method_defined?` check that there since
this class was added in 08ec2e8
is that it's to prevent accidentally overriding Matcher or own methods.

If my understanding is correct, then we should ignore methods inherited from
`Object`.

lib/rspec/mocks/matchers/receive.rb

@@ -55,8 +55,9 @@ def setup_any_instance_allowance(subject, &block)
           setup_any_instance_method_substitute(subject, :stub, block)
         end
 
+        own_methods = (instance_methods - superclass.instance_methods)
         MessageExpectation.public_instance_methods(false).each do |method|
-          next if method_defined?(method)
+          next if own_methods.include?(method)
 
           define_method(method) do |*args, &block|
             @recorded_customizations << ExpectationCustomization.new(method, args, block)