Don't ignore generate.go, avoiding spurious warning

Author: thockin

examples/defaulter-gen/output_tests/generate.go

@@ -1,6 +1,3 @@
-// Ignore this file to prevent zz_generated for this package
-//go:build !ignore_autogenerated
-
 //go:generate go run k8s.io/gengo/examples/defaulter-gen -i k8s.io/gengo/examples/defaulter-gen/output_tests/... -O zz_generated --go-header-file=../../../boilerplate/boilerplate.go.txt -o . --trim-path-prefix=k8s.io/gengo/examples/defaulter-gen/output_tests
 package output_tests_test