[MacPorts] #50847: Update llvm-38 to release tarball, remove subversion dependency

[MacPorts]

#50847: Update llvm-38 to release tarball, remove subversion dependency
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  Reporter:  sierkb@…  |      Owner:  jeremyhu@…
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:
      Port:  llvm-38   |
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Comment (by jeremyhu@…):

 Yeah, I’ll get around to this eventually.  Note that the revision we
 currently have is newer than the 3.8.0 tags, so we’ll need to grab some
 patches off the branch or just wait until 3.8.1 to do this.

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Ticket URL: <https://trac.macports.org/ticket/50847#comment:2>
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