Add another header to be checked

cmr=v1.7.5:reviewer=rhc:subject=Add usock oob support

This commit was SVN r30432.

configure.ac

@@ -19,7 +19,7 @@
 # Copyright (c) 2012      Oracle and/or its affiliates.  All rights reserved.
 # Copyright (c) 2013      Mellanox Technologies, Inc.
 #                         All rights reserved.
-# Copyright (c) 2013      Intel, Inc.  All rights reserved.
+# Copyright (c) 2013-2014 Intel, Inc.  All rights reserved.
 # $COPYRIGHT$
 # 
 # Additional copyrights may follow
@@ -623,7 +623,7 @@ AC_CHECK_HEADERS([alloca.h aio.h arpa/inet.h dirent.h \
     sys/ioctl.h sys/mman.h sys/param.h sys/queue.h \
     sys/resource.h sys/select.h sys/socket.h sys/sockio.h \
     stdarg.h sys/stat.h sys/statfs.h sys/statvfs.h sys/time.h sys/tree.h \
-    sys/types.h sys/uio.h net/uio.h sys/utsname.h sys/vfs.h sys/wait.h syslog.h \
+    sys/types.h sys/uio.h sys/un.h net/uio.h sys/utsname.h sys/vfs.h sys/wait.h syslog.h \
     time.h termios.h ulimit.h unistd.h util.h utmp.h malloc.h \
     ifaddrs.h crt_externs.h regex.h signal.h \
     ioLib.h sockLib.h hostLib.h shlwapi.h sys/synch.h limits.h db.h ndbm.h])