warnings from backtrace

[Hal Murray]

> Hmm, looks to me like it should have compiled, then failed due to missing
> -lexecinfo.  Can you confirm you have HAVE_BACKTRACE_SYMBOLS_FD in your
> build/config.h?  And configured with --enable-seccomp? 

It's a BSD box, not Linux, so no seccomp.  But we want the backtrace for 
other than seccomp, right?

>From grep BACK config.h
#define USEBACKTRACE 1
/* #undef HAVE__UNWIND_BACKTRACE */
/* #undef HAVE_BACKTRACE_SYMBOLS_FD */


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