[MacPorts] #66552: Add a variant that supports 'persist'

[MacPorts]

#66552: Add a variant that supports 'persist'
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 Reporter:  esbugz       |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  opendoas
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 As far as I understand from the dev comment below, the `persist` option is
 unsupported by default and has to be enabled at build time

 Would you please add such a variant?

 [https://github.com/Duncaen/OpenDoas/issues/32]
 {{{
 This has to be enabled explicitly at build time by running configure with
 --with-timestamp, the gentoo build doesn't do that.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66552>
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