[PATCH] testsuite: stdlib/isomac.c: add missing include

[Jonathan Nieder]

Aurelien Jarno wrote:

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

Indeed, in POSIX close() requires unistd.h[*].

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>

[*] pubs.opengroup.org/onlinepubs/9699919799/functions/close.html