[MacPorts] #54509: nginx: add http2 to default variants

[MacPorts]

#54509: nginx: add http2 to default variants
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 Reporter:  mohd-akram   |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.4.1
 Keywords:               |       Port:  nginx
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 It is the current version of HTTP, after all :)

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Ticket URL: <https://trac.macports.org/ticket/54509>
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