Omit version for v1 certificates.

When calling X509_set_version to set v1 certificate, that should mean
that the version number field is omitted.

(Imported from upstream's 8c0d19d8577c9a96b65622bfa92d0affd6bbb4ac)

Change-Id: If433fda7b6ccbd899f3379a38581c351cf4a82da

crypto/x509/x509_set.c

diff --git a/crypto/x509/x509_set.c b/crypto/x509/x509_set.c
index 4288571..06658b0 100644
--- a/crypto/x509/x509_set.c
+++ b/crypto/x509/x509_set.c
@@ -64,6 +64,12 @@
 int X509_set_version(X509 *x, long version)
 	{
 	if (x == NULL) return(0);
+	if (version == 0)
+		{
+		M_ASN1_INTEGER_free(x->cert_info->version);
+		x->cert_info->version = NULL;
+		return(1);
+		}
 	if (x->cert_info->version == NULL)
 		{
 		if ((x->cert_info->version=M_ASN1_INTEGER_new()) == NULL)