[MacPorts] #38362: transmission - add +daemon variant

[MacPorts]

#38362: transmission - add +daemon variant
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 Reporter:  quintas@…    |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:  tranmission
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 transmission has the option to be built as a daemon, which uses much less
 resources and is better suited for those of us running it on remote
 servers. please add a +daemon variant to build as only a daemon. these are
 the flags i use to compile: ```--enable-cli --enable-daemon --without-gtk
 --disable-mac```

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Ticket URL: <https://trac.macports.org/ticket/38362>
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