[MacPorts] #54420: yarn @ 0.24.6: Don't install node6 if 'node' already installed by other means

[MacPorts]

#54420: yarn @ 0.24.6: Don't install node6 if 'node' already installed by other
means
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 Reporter:  mattbishop   |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  yarn
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 I am using MacPorts to install and manage yarn, but I install node.js
 differently, mostly to use different versions of node as needed. The yarn
 port automatically installs node6 even though 'node' is on the path. I
 have to uninstall node every time I update yarn.

 It would be great if yarn first checked for 'node' on the path and skipped
 node6.

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Ticket URL: <https://trac.macports.org/ticket/54420>
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