[tor-bugs] #21826 [Core Tor/Tor]: clang warnings because of "empty" hs_service.c file in 0.3.0

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#21826: clang warnings because of "empty" hs_service.c file in 0.3.0
------------------------------+--------------------------------
     Reporter:  asn           |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs
Actual Points:                |  Parent ID:
       Points:  0.1           |   Reviewer:
      Sponsor:  SponsorR-can  |
------------------------------+--------------------------------
 Currently (in 0.3.0) the code in `hs_service.c` is disabled using '#ifdef
 TOR_UNIT_TESTS` and is only used for unittests. We will remove these
 `#ifdef` guards in 0.3.2 when we merge the rest of the service-side code.

 Unfortunately, as it seems having an empty .c file is no good, since empty
 translation units (i.e. files) are undefined behavior in C.

 Sebastian pointed this out, and said that his clang is throwing warnings
 at him because of that. He says that compilation proceeds normally, but it
 might be a good thing to fix anyhow.

 We could fix this by adding a static variable on top to silence the
 warning, or by removing the #ifdef guards.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21826>
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