ASN1_ITEM version of ASN1_dup(). Might want
something more efficient later...

crypto/asn1/asn1.h

diff --git a/crypto/asn1/asn1.h b/crypto/asn1/asn1.h
index 902aebb..ef88bb3 100644
--- a/crypto/asn1/asn1.h
+++ b/crypto/asn1/asn1.h
@@ -801,6 +801,8 @@
 /* Used to implement other functions */
 char *ASN1_dup(int (*i2d)(),char *(*d2i)(),char *x);
 
+void *ASN1_item_dup(const ASN1_ITEM *it, void *x);
+
 #ifndef NO_FP_API
 char *ASN1_d2i_fp(char *(*xnew)(),char *(*d2i)(),FILE *fp,unsigned char **x);
 int ASN1_i2d_fp(int (*i2d)(),FILE *out,unsigned char *x);