Export some extra functions and values.

This change exports SSL_cutthrough_complete and EVP_EncodedLength (which
were missed below) and also exports all ASN.1 "item" values because
Android needs that.

Change-Id: I6d10f935bb52ed6d682607a4016dd2b87758e3de
Reviewed-on: https://boringssl-review.googlesource.com/1557
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/base64.h

diff --git a/include/openssl/base64.h b/include/openssl/base64.h
index 521004a..de94d8e 100644
--- a/include/openssl/base64.h
+++ b/include/openssl/base64.h
@@ -106,7 +106,7 @@
  * to call |EVP_EncodeBlock| on an input of length |len|. This includes the
  * final NUL that |EVP_EncodeBlock| writes. It returns one on success or zero
  * on error. */
-int EVP_EncodedLength(size_t *out_len, size_t len);
+OPENSSL_EXPORT int EVP_EncodedLength(size_t *out_len, size_t len);
 
 
 /* Decoding */