[PATCH] Document that -k is only available with libunwind

[Giedrius Statkevičius]

git send-email ate the one-line summary line. I'll resend.

On 2015.03.03 21:24, Giedrius Statkevičius wrote:
> Without this the user may get confused why `man strace` reports that
> there is a option called -k but it doesn't work.
> 
> * strace.1: Add that -k is only available when strace is compiled with
>   libunwind support.
> ---
>  strace.1 | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/strace.1 b/strace.1
> index 1e69217..8c25322 100644
> --- a/strace.1
> +++ b/strace.1
> @@ -269,6 +269,7 @@ Print the instruction pointer at the time of the system call.
>  .TP
>  .B \-k
>  Print the execution stack trace of the traced processes after each system call (experimental).
> +Only available if compiled with libunwind support.
>  .TP
>  .B \-q
>  Suppress messages about attaching, detaching etc.  This happens
>