Include TA in checks/callback with partial chains.

When a chain is complete and ends in a trusted root checks are also performed
on the TA and the callback notified with ok==1. For consistency do the same for
chains where the TA is not self signed.

(Imported from upstream's b07e4f2f46)

crypto/x509/x509_vfy.c

@@ -1726,7 +1726,7 @@ static int internal_verify(X509_STORE_CTX *ctx)
 		xs=xi;
 	else
 		{
-		if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN && n == 0)
+		if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 			{
 			xs = xi;
 			goto check_cert;