Add OSS-Fuzz support to the Bazel fuzzing rules. (#96)

* The OSS-Fuzz support in one change.

* Clarify why we're skipping the fuzzing build mode flag.

examples/BUILD

diff --git a/examples/BUILD b/examples/BUILD
index 0a0c4fa..f53eb22 100644
--- a/examples/BUILD
+++ b/examples/BUILD
@@ -42,6 +42,11 @@
 cc_fuzz_test(
     name = "empty_fuzz_test_with_dict",
     srcs = ["empty_fuzz_test.cc"],
+    corpus = [
+        "corpus_0.txt",
+        ":corpus_filegroup",
+        "test_corpus_dir",
+    ],
     dicts = ["dict_dir/valid.dict"],
 )