[LTP] [COMMITTED] [PATCH] syscalls/prctl07: Fix build.

[Yang Xu <xuyang2018.jy@cn.fujitsu.com>]

> Ideally this is last fix for prctl07.
>
> Since I've changed the check_proc_capamb() to use macro definition
> instead of raw integer value we depend on sys/capability.h being
> included to compile the code.
>
> So this commit changes:
>
> The sys/capability.h is included under HAVE_SYS_CAPABILITY_H now and so
> the function is ifdefed out if we don't have that header.
>
> Also it looks like HAVE_LIBCAP is not defined unless libcap supports
> cap_compare() which should be fixed. The check for libcap and
> cap_compare() has to be uncoupled but that has to be done in a sepratate
> patch.
Hi Cyril

     I have a patch for this on 2019.5 [1] but not correct way.  Also, I am going to simpify and remove some m4.
I will uncouple libcap and cap_compare in ltp-cap.m4.

[1]http://lists.linux.it/pipermail/ltp/2019-May/011925.html

> Signed-off-by: Cyril Hrubis<chrubis@suse.cz>
> ---
>   testcases/kernel/syscalls/prctl/prctl07.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/testcases/kernel/syscalls/prctl/prctl07.c b/testcases/kernel/syscalls/prctl/prctl07.c
> index 37d77df33..79f7710a8 100644
> --- a/testcases/kernel/syscalls/prctl/prctl07.c
> +++ b/testcases/kernel/syscalls/prctl/prctl07.c
> @@ -25,7 +25,7 @@
>   #include<sys/prctl.h>
>   #include<stdlib.h>
>   #include "config.h"
> -#ifdef HAVE_LIBCAP
> +#ifdef HAVE_SYS_CAPABILITY_H
>   # include<sys/capability.h>
>   #endif
>   #include "lapi/syscalls.h"
> @@ -35,7 +35,8 @@
>
>   #define PROC_STATUS "/proc/self/status"
>
> -static inline void check_proc_capamb(char *message, int flag)
> +#ifdef HAVE_SYS_CAPABILITY_H
> +static void check_proc_capamb(char *message, int flag)
>   {
>   	int cap_num;
>   	char CapAmb[20];
> @@ -62,6 +63,7 @@ static inline void check_proc_capamb(char *message, int flag)
>   			"%s, CapAmb in %s doesn't have CAP_NET_BIND_SERVICE",
>   			message, PROC_STATUS);
>   }
> +#endif
>
>   static inline void check_cap_raise(unsigned int cap, char *message, int fail_flag)
>   {