Remove EVP_PKEY_dup.

All callers have been moved to EVP_PKEY_up_ref. (Neither spelling exists
upstream so we only had our own callers to move.)

Change-Id: I267f14054780fe3d6dc1170b7b6ae3811a0d1a9a
Reviewed-on: https://boringssl-review.googlesource.com/5291
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/evp.h

diff --git a/include/openssl/evp.h b/include/openssl/evp.h
index d0acb48..dd90b7d 100644
--- a/include/openssl/evp.h
+++ b/include/openssl/evp.h
@@ -642,17 +642,6 @@
 
 /* Deprecated functions. */
 
-/* EVP_PKEY_dup adds one to the reference count of |pkey| and returns
- * |pkey|.
- *
- * WARNING: this is a |_dup| function that doesn't actually duplicate! Use
- * |EVP_PKEY_up_ref| if you want to increment the reference count without
- * confusion. */
-OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_dup(EVP_PKEY *pkey);
-
-
-/* Private functions */
-
 /* OpenSSL_add_all_algorithms does nothing. */
 OPENSSL_EXPORT void OpenSSL_add_all_algorithms(void);
 
@@ -665,6 +654,9 @@
 /* EVP_cleanup does nothing. */
 OPENSSL_EXPORT void EVP_cleanup(void);
 
+
+/* Private functions */
+
 /* EVP_PKEY_asn1_find returns the ASN.1 method table for the given |nid|, which
  * should be one of the |EVP_PKEY_*| values. It returns NULL if |nid| is
  * unknown. */