[tcpdump] New configure option for debugging

[Francois-Xavier Le Bail via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Francois-Xavier Le Bail <devel.fx.lebail () orange fr>
>
> Date: Wed, 19 Jan 2022 18:11:51 +0100
>
> Hello,
>
> The usage is:
> ./configure --enable-instrument-functions
>
> This should help some debugging processes.
>  
> Enabling it generate instrumentation calls for entry and exit to functions.
> Just after function entry and just before function exit, these profiling functions are called and print the function 
> names with indentation and call level.
>  
> To instrument a static function, remove temporarily the static specifier.
>
> -- 
> Francois-Xavier
>
> --- End Message ---
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