ptest needs buildtest-TESTS and runtest-TESTS targets.
serial-tests is required to generate those targets.

Signed-off-by: Tudor Florea <tudor.florea@enea.com>
Upstream-Status: Inappropriate
(default automake behavior incompatible with ptest)

Index: ethtool-4.13/configure.ac
===================================================================
--- ethtool-4.13.orig/configure.ac
+++ ethtool-4.13/configure.ac
@@ -2,7 +2,7 @@ dnl Process this file with autoconf to p
 AC_INIT(ethtool, 4.13, netdev@vger.kernel.org)
 AC_PREREQ(2.52)
 AC_CONFIG_SRCDIR([ethtool.c])
-AM_INIT_AUTOMAKE([gnu])
+AM_INIT_AUTOMAKE([gnu serial-tests])
 AC_CONFIG_HEADERS([ethtool-config.h])
 
 AM_MAINTAINER_MODE