Replace deprecated <strings.h> with <string.h>

I guess this won't really solve anything, just the issue.

Closes: #521

Signed-off-by: Jozef Pupava <jpupava@suse.com>
---
 testcases/kernel/containers/share/ns_create.c                           | 2 +-
 testcases/kernel/fs/fsx-linux/fsx-linux.c                               | 2 +-
 .../open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c     | 2 +-
 .../open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c     | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

Hi!
> Closes: #521
> 
> Signed-off-by: Jozef Pupava <jpupava@suse.com>
> ---
>  testcases/kernel/containers/share/ns_create.c                           | 2 +-
>  testcases/kernel/fs/fsx-linux/fsx-linux.c                               | 2 +-
>  .../open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c     | 2 +-
>  .../open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c     | 2 +-
>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/testcases/kernel/containers/share/ns_create.c b/testcases/kernel/containers/share/ns_create.c
> index 1d0339e71..4a4007c3a 100644
> --- a/testcases/kernel/containers/share/ns_create.c
> +++ b/testcases/kernel/containers/share/ns_create.c
> @@ -30,7 +30,7 @@
>  #include <sys/stat.h>
>  #include <unistd.h>
>  #include <string.h>
> -#include <strings.h>
> +#include <string.h>

The string.h include is already there, so we just need to delete it
here.

>  #include <errno.h>
>  #include "test.h"
>  #include "lapi/namespaces_constants.h"
> diff --git a/testcases/kernel/fs/fsx-linux/fsx-linux.c b/testcases/kernel/fs/fsx-linux/fsx-linux.c
> index 02f3eb827..4a20f4da6 100644
> --- a/testcases/kernel/fs/fsx-linux/fsx-linux.c
> +++ b/testcases/kernel/fs/fsx-linux/fsx-linux.c
> @@ -43,7 +43,7 @@
>  #include <sys/param.h>
>  #include <limits.h>
>  #include <time.h>
> -#include <strings.h>
> +#include <string.h>
>  #include <sys/time.h>
>  #endif
>  #include <fcntl.h>
> diff --git a/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c b/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c
> index dd42bbd91..97bdbff5d 100644
> --- a/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c
> +++ b/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/3-1.c
> @@ -20,7 +20,7 @@
>  #endif
>  #include <semaphore.h>
>  #include <stdio.h>
> -#include <strings.h>
> +#include <string.h>
>  #include <time.h>
>  #include <unistd.h>
>  #include "posixtest.h"
> diff --git a/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c b/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c
> index 79de0af7f..da2cd3084 100644
> --- a/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c
> +++ b/testcases/open_posix_testsuite/conformance/interfaces/sem_timedwait/7-1.c
> @@ -21,7 +21,7 @@
>  #endif
>  #include <semaphore.h>
>  #include <stdio.h>
> -#include <strings.h>
> +#include <string.h>
>  #include <time.h>
>  #include <unistd.h>
>  #include "posixtest.h"

As far as I can tell there are no string functions used in the
sem_timedwait() tests, so we can as well just remove the include in
these two.