[tor-bugs] #23715 [Core Tor/Torsocks]: Support `memfd_create(2)`

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#23715: Support `memfd_create(2)`
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     Reporter:  yawning            |      Owner:  dgoulet
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Core Tor/Torsocks  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 Enough things use this now that it's probably sensible to support this in
 the `syscall(2)` wrapper.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23715>
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