[tor-bugs] #17151 [Tor]: FreeBSD: fix test_bt failures

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#17151: FreeBSD: fix test_bt failures
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 Reporter:  saper   |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  Tor: 0.2.???
Component:  Tor     |        Version:  Tor: 0.2.7.2-alpha
 Keywords:  build   |  Actual Points:
Parent ID:          |         Points:
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 Backtrace analysis is not supported on FreeBSD unless linked with
 -lexecinfo

 The test should be skipped if the functionality has not been detected by
 autoconf.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17151>
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