[tor-bugs] #25341 [Core Tor/Tor]: Remove now-unnecessary Rust linking workaround

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#25341: Remove now-unnecessary Rust linking workaround
------------------------------+--------------------------------
     Reporter:  isis          |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.2.2-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  .1            |   Reviewer:
      Sponsor:                |
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 We've got the following stanza in our `configure.ac`:

 {{{
   dnl This is a workaround for #46797
   dnl (a.k.a https://github.com/rust-lang/rust/issues/46797 ).  Once the
   dnl upstream bug is fixed, we can remove this workaround.
   case "$host_os" in
       darwin*)
         TOR_RUST_EXTRA_LIBS="-lresolv"
     ;;
   esac
 }}}

 It looks like https://github.com/rust-lang/rust/issues/46797 has been
 resolved as of 18 December 2017, so we can probably remove this workaround
 now! (Someone who is on MacOS should probably test this, I don't have
 access to any Macs right now.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25341>
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