path/filepath: make Join handle UNC paths on Windows
Unless the first element is a Universal Naming Convention (UNC)[0] path, Join shouldn't create a UNC path on Windows. For example, Join inadvertently creates a UNC path on Windows when told to join at least three non-empty path elements, where the first element is `\` or `/`. This CL prevents creation of a UNC path prefix when the first path element isn't a UNC path. Since this introduces some amount of Windows-specific logic, Join is moved to a per GOOS implementation. Fixes #9167. [0]: http://msdn.microsoft.com/en-us/library/gg465305.aspx Change-Id: Ib6eda597106cb025137673b33c4828df1367f75b Reviewed-on: https://go-review.googlesource.com/2211Reviewed-by:Alex Brainman <alex.brainman@gmail.com>
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