Adjust parameter type for util_EVP_PKEY_id

The function pointer needs to match the prototype for i2d_PublicKey
and i2d_PrivateKey.

Submitted upstream: <https://pagure.io/certmonger/pull-request/265>

diff --git a/src/util-o.c b/src/util-o.c
index c05872ceb1495cee..7feecb9d6a2adf23 100644
--- a/src/util-o.c
+++ b/src/util-o.c
@@ -551,7 +551,7 @@ util_NETSCAPE_SPKI_set_sig_alg(NETSCAPE_SPKI *spki, const X509_ALGOR *sig_alg)
 
 static EVP_PKEY *
 util_EVP_PKEY_dup(EVP_PKEY *pkey,
-		  int (*i2d)(EVP_PKEY *, unsigned char **),
+		  int (*i2d)(const EVP_PKEY *, unsigned char **),
 		  EVP_PKEY *(*d2i)(int, EVP_PKEY **, const unsigned char **, long))
 {
 	EVP_PKEY *k;