Add four, basic fuzz tests.

This change adds fuzzing tests for:
  ∙ Certificate parsing
  ∙ Private key parsing
  ∙ ClientHello parsing
  ∙ Server first flow (ServerHello, Certificate, etc) parsing.

Change-Id: I5f53282263eaaff69b1a03c819cca73750433653
Reviewed-on: https://boringssl-review.googlesource.com/6460
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/fuzz/privkey_corpus/c7639de8641dc12f675107b0ce6aee03e1f4ca46 b/fuzz/privkey_corpus/c7639de8641dc12f675107b0ce6aee03e1f4ca46
new file mode 100644
index 0000000..c76f07c
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+ŸŸ
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