[MacPorts] #47986: ast: update to 8.0.4

[MacPorts]

#47986: ast: update to 8.0.4
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 Reporter:  ryandesign@…  |      Owner:  aronnax@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  ast
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 This patch updates ast to 8.0.4, updates the homepage, and moves
 documentation files to the correct directory.

 In addition, it looks like this port manually creates compiler variants.
 Consider moving to the compilers 1.0 portgroup.

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Ticket URL: <https://trac.macports.org/ticket/47986>
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