Test creating archive from non-git package containing symlinks

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="96" height="96"hspace="10"> Issue by munificent
Originally opened as dart-lang/sdk#7357

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This patch: https://codereview.chromium.org/11558036/

fixes a bug where if have a package that:

1. Has a "packages" directory. (You've pub installed it.)
2. Is not using git.

Then you'll get bad paths when trying to generate the archive. This is stems from the fact that Directory.list() in dart:io gives us paths after symlinks have been resolved.

The patch works around it, but we should have a cleaner fix. We should also have a test that can repro this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Removed Type-Defect label.
Added Type-Enhancement label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Removed this from the M3 milestone.
Added this to the M4 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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The nice solution for this has been in for a long time, the test is part of issue #377.

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Added Fixed label.