Fix the versioning of Dart SDK packages

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3
Originally opened as dart-lang/sdk#4352

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We used to use the /revision file in the Dart SDK to determine the version of the packages contained within, but that file has apparently disappeared. We should generate the version from the timestamp on the /create.stamp file instead.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1269969?v=3" align="left" width="48" height="48"hspace="10"> Comment by devoncarew

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I still see this file as existing in the latest continuous builds (http://gsdview.appspot.com/dart-editor-archive-continuous/latest/). What archive is it missing from?

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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I made a local build, straight from source, using ./tool/build.py -m release The output dir, xcodebuild/ReleaseIA32/dart-sdk is what I point DART_SDK to.

I suspect our build process only uses "svn info", and it should use "git svn info" if "svn info" isn't working.

[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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Added this to the M1 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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I'm building from Git, and I have a revision file in my SDK output.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Build script generates a revision file for both svn and git now.

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Added Fixed label.