Add some more compatibility functions.

Change-Id: I56afcd896cb9de1c69c788b4f6395f4e78140d81
Reviewed-on: https://boringssl-review.googlesource.com/28265
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/obj.h b/include/openssl/obj.h
index 374658e..764188f 100644
--- a/include/openssl/obj.h
+++ b/include/openssl/obj.h
@@ -222,6 +222,9 @@
                                                                void *arg),
                                     void *arg);
 
+// OBJ_cleanup does nothing.
+OPENSSL_EXPORT void OBJ_cleanup(void);
+
 
 #if defined(__cplusplus)
 }  // extern C