[MacPorts] #58894: emscripten @1.38.42: new port

[MacPorts]

#58894: emscripten @1.38.42: new port
------------------------+------------------------
 Reporter:  FranklinYu  |      Owner:  (none)
     Type:  request     |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  emscripten
------------------------+------------------------
 Links:
  - [https://emscripten.org/ Homepage]
  - [https://github.com/emscripten-core/emscripten source code]

 Other distributions:
  - [https://packages.ubuntu.com/bionic/emscripten Ubuntu]
  - [https://www.archlinux.org/packages/community/x86_64/emscripten/ Arch
 Linux]
  - [https://formulae.brew.sh/formula/emscripten Homebrew]

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Ticket URL: <https://trac.macports.org/ticket/58894>
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