[tor-bugs] #24424 [Core Tor/Tor]: fails to build with libseccomp-dev installed on arm64

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#24424: fails to build with libseccomp-dev installed on arm64
------------------------------+------------------------------
     Reporter:  weasel        |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+------------------------------
 {{{
 13:21:06 ../tor/src/common/sandbox.c: In function 'sigsys_debugging':
 13:21:06 ../tor/src/common/sandbox.c:1812:35: error: 'mcontext_t {aka
 struct sigcontext}' has no member named 'M_SYSCALL'
 13:21:06    syscall = (int) ctx->uc_mcontext.M_SYSCALL;
 13:21:06                                    ^
 13:21:13 Makefile:5615: recipe for target 'src/common/sandbox.o' failed
 13:21:13 make[1]: *** [src/common/sandbox.o] Error 1
 }}}

 Note that on arm64, __arm__ is not defined.

 cf. https://wiki.debian.org/ArchitectureSpecificsMemo

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24424>
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