[MacPorts] #59643: Please add package version and variant info to `make.log`

[MacPorts]

#59643: Please add package version and variant info to `make.log`
----------------------+--------------------
 Reporter:  lemzwerg  |      Owner:  (none)
     Type:  request   |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  base      |    Version:
 Keywords:            |       Port:
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 I've noticed that in `main.log` files there is no information what version
 and variants have been requested – for example,
 {{{
   ImageMagick @6.9.9-40_7+x11
 }}}
 I suggest to make `port` add this information at the very top of
 `main.log`.  This would also help identify various `make.log` files more
 easily.

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Ticket URL: <https://trac.macports.org/ticket/59643>
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