external/boringssl: Sync to f21650709a6f76e829ddcc77fe221c9d6a5c12de.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/348f0d8db9c2a0eca0503ba654020209c579d552..f21650709a6f76e829ddcc77fe221c9d6a5c12de

Test: BoringSSL CTS Presubmits.
Change-Id: Ie6e99c3315c552068b5ea57e31b1af7ff94f9b0f
diff --git a/src/include/openssl/md4.h b/src/include/openssl/md4.h
index b66fcb0..52b88ca 100644
--- a/src/include/openssl/md4.h
+++ b/src/include/openssl/md4.h
@@ -64,31 +64,31 @@
 #endif
 
 
-/* MD4. */
+// MD4.
 
-/* MD4_CBLOCK is the block size of MD4. */
+// MD4_CBLOCK is the block size of MD4.
 #define MD4_CBLOCK 64
 
-/* MD4_DIGEST_LENGTH is the length of an MD4 digest. */
+// MD4_DIGEST_LENGTH is the length of an MD4 digest.
 #define MD4_DIGEST_LENGTH 16
 
-/* MD4_Init initialises |md4| and returns one. */
+// MD4_Init initialises |md4| and returns one.
 OPENSSL_EXPORT int MD4_Init(MD4_CTX *md4);
 
-/* MD4_Update adds |len| bytes from |data| to |md4| and returns one. */
+// MD4_Update adds |len| bytes from |data| to |md4| and returns one.
 OPENSSL_EXPORT int MD4_Update(MD4_CTX *md4, const void *data, size_t len);
 
-/* MD4_Final adds the final padding to |md4| and writes the resulting digest to
- * |md|, which must have at least |MD4_DIGEST_LENGTH| bytes of space. It
- * returns one. */
+// MD4_Final adds the final padding to |md4| and writes the resulting digest to
+// |md|, which must have at least |MD4_DIGEST_LENGTH| bytes of space. It
+// returns one.
 OPENSSL_EXPORT int MD4_Final(uint8_t *md, MD4_CTX *md4);
 
-/* MD4 writes the digest of |len| bytes from |data| to |out| and returns |out|.
- * There must be at least |MD4_DIGEST_LENGTH| bytes of space in |out|. */
+// MD4 writes the digest of |len| bytes from |data| to |out| and returns |out|.
+// There must be at least |MD4_DIGEST_LENGTH| bytes of space in |out|.
 OPENSSL_EXPORT uint8_t *MD4(const uint8_t *data, size_t len, uint8_t *out);
 
-/* MD4_Transform is a low-level function that performs a single, MD4 block
- * transformation using the state from |md4| and 64 bytes from |block|. */
+// MD4_Transform is a low-level function that performs a single, MD4 block
+// transformation using the state from |md4| and 64 bytes from |block|.
 OPENSSL_EXPORT void MD4_Transform(MD4_CTX *md4, const uint8_t *block);
 
 struct md4_state_st {
@@ -100,7 +100,7 @@
 
 
 #if defined(__cplusplus)
-}  /* extern C */
+}  // extern C
 #endif
 
-#endif  /* OPENSSL_HEADER_MD4_H */
+#endif  // OPENSSL_HEADER_MD4_H