Build nvi 2.1.3 on Mac, missing build instructions

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> 
> When trying to run ‘bsdmake’, it puts the error message like below, add
> ‘-lresolv’ suppresses this.
> 
> Undefined symbols for architecture x86_64:
>  "_res_9_b64_ntop", referenced from:
>      _rcv_dlnwrite in recover.o
>  "_res_9_b64_pton", referenced from:
>      _rcv_dlnread in recover.o
> ld: symbol(s) not found for architecture x86_64
> 
> 
> And this error is not called out when using cmake?
> That's... interesting.
> 
This error is not shown with cmake.
After work around the db.h issue, I can get the binary via make.

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