[MacPorts] #67520: Support notify_is_valid_token to allow Go 1.20+ binaries to run on older than 10.10

[MacPorts]

#67520: Support notify_is_valid_token to allow Go 1.20+ binaries to run on older
than 10.10
----------------------+----------------------------
 Reporter:  krackers  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  legacy-support
----------------------+----------------------------
 https://github.com/golang/go/commit/76d39ae3499238ac7efb731f4f4cd47b1b3288ab
 seems to add a call to notify_is_valid_token, and the reasoning for doing
 so is apparently to work around some bug in exec(), as described in https
 ://go-review.googlesource.com/c/go/+/451735/3//COMMIT_MSG#49

 It's not clear if the bug that's being worked around existed on older osx
 versions as well. Polyfilling this function seems quite difficult as it
 accesses a lot of internal state of libnotify. (It's theoretically
 possible to do this of course, since libnotify is open source and we can
 see the implementation, but it would require a lot of runtime hijinks to
 get the address of hidden visibility symbols).

 Probably the easier approach is patching Go itself.

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Ticket URL: <https://trac.macports.org/ticket/67520>
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