[glibc/release/2.29/master] testsuite: stdlib/isomac.c: add missing include

[Sunil Pandey <skpgkp2@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6e9f210719308153a12d7a259d6ac4340677c9b

commit b6e9f210719308153a12d7a259d6ac4340677c9b
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Tue Jan 8 21:10:28 2019 +0100

    testsuite: stdlib/isomac.c: add missing include
    
    When running the testsuite, building stdlib/isomac.c outputs the
    following warning:
    
      gcc -O   -D_GNU_SOURCE -DIS_IN_build -include /home/aurel32/glibc-build/config.h isomac.c -o /home/aurel32/glibc-build/stdlib/isomac
      isomac.c: In function ‘get_null_defines’:
      isomac.c:260:3: warning: implicit declaration of function ‘close’; did you mean ‘pclose’? [-Wimplicit-function-declaration]
         close (fd);
         ^~~~~
         pclose
    
    Fix that by adding the <unistd.h> include.
    
    Changelog:
            * stdlib/isomac.c: Include <unistd.h>.
    (cherry picked from commit 11f382ee780649549428cb25af3a9f1d3465868d)

Diff:
---
 ChangeLog       | 4 ++++
 stdlib/isomac.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 1bd2a57c73..a7bacf7b7b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-02-03  Aurelien Jarno  <aurelien@aurel32.net>
+
+	* stdlib/isomac.c: Include <unistd.h>.
+
 2019-06-06  Florian Weimer  <fweimer@redhat.com>
 
 	* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Do not use
diff --git a/stdlib/isomac.c b/stdlib/isomac.c
index 37f564c82a..7d743cb8e5 100644
--- a/stdlib/isomac.c
+++ b/stdlib/isomac.c
@@ -74,6 +74,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #define HEADER_MAX          256