[ObjC] Output directive to disable clang-format on generated files.
Regenerate the WKTs accordingly.
diff --git a/objectivec/GPBDuration.pbobjc.h b/objectivec/GPBDuration.pbobjc.h
index d6236b0..fda9b47 100644
--- a/objectivec/GPBDuration.pbobjc.h
+++ b/objectivec/GPBDuration.pbobjc.h
@@ -1,6 +1,8 @@
// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: google/protobuf/duration.proto
+// clang-format off
+
#import "GPBDescriptor.h"
#import "GPBMessage.h"
#import "GPBRootObject.h"
@@ -131,3 +133,5 @@
#pragma clang diagnostic pop
// @@protoc_insertion_point(global_scope)
+
+// clange-format on