[MacPorts] #60942: go: Support arm64

[MacPorts]

#60942: go: Support arm64
--------------------------+----------------------
  Reporter:  ryandesign   |      Owner:  ci42
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  go           |
--------------------------+----------------------

Comment (by raw-bin):

 On a fresh installation on Big Sur 11.2.2 on my Apple M1 based MacBook Pro
 13, using macports from git, I find that attempting to install go results
 in x86_64 assets getting used.

 Relevant details:

 {{{
 > uname -a
 Darwin 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:06:51 PST 2021;
 root:xnu-7195.81.3~1/RELEASE_ARM64_T8101 arm64

 > xcodebuild -version
 Xcode 12.4
 Build version 12D4e

 > sudo port install go
 Password:
 --->  Fetching archive for go
 --->  Attempting to fetch go-1.16_0.darwin_20.x86_64.tbz2 from
 https://lil.fr.packages.macports.org/go

 > git log --pretty=oneline | head -n 5
 0c2f339374a5cacd904c32b88b8f773c4b93d4cd jsonnet-bundler: new port
 1a5f4862932cb4be9bc910574697553c7a71927c tanka: new port
 7f54ecdc0537426d0dee10a9c50705b90463db80 AppCSXCAD: new port
 35422026ce47d21e21e03746a6122c24118455d2 QCSXCAD: new port
 a7cb777cb8db125f6fe60581ce62b64dfa044b4c py-rich: update to 9.13.0

 }}}

 Is this expected ?

-- 
Ticket URL: <https://trac.macports.org/ticket/60942#comment:2>
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