hg: jdk/jdk: 8211146: fix problematic elif-tests after recent gcc warning changes Werror=undef

[matthias.baesken at sap.com]

Changeset: 511a9946f83e
Author:    mbaesken
Date:      2018-09-26 14:28 +0200
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/511a9946f83e

8211146: fix problematic elif-tests after recent gcc warning changes Werror=undef
Reviewed-by: stuefe, clanger, dholmes, chegar, alanb

! src/java.base/unix/native/libnet/net_util_md.h
! src/java.base/unix/native/libnio/ch/NativeThread.c
! src/java.base/unix/native/libnio/ch/nio_util.h
! src/jdk.jdwp.agent/unix/native/libjdwp/util_md.h