[MacPorts] #69342: shaderc: new port

[MacPorts]

#69342: shaderc: new port
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 Reporter:  DanielO     |      Owner:  (none)
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:  haspatch    |       Port:  shaderc
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 Add shaderc port.

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Ticket URL: <https://trac.macports.org/ticket/69342>
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