Use X509_cmp_time() in -checkend option, to support GeneralizedTime.

apps/x509.c

@@ -999,9 +999,9 @@ bad:
 
 	if (checkend)
 		{
-		time_t tnow=time(NULL);
+		time_t tcheck=time(NULL) + checkoffset;
 
-		if (ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(x), tnow+checkoffset) == -1)
+		if (X509_cmp_time(X509_get_notAfter(x), &tcheck) < 0)
 			{
 			BIO_printf(out,"Certificate will expire\n");
 			ret=1;