Commits on Jan 12, 2021

1. Fix links vars showing up for testing packages …

   If a package is tested and the library for the package wasn't built
   (e.g. only tested or it wasn't present) then the `links` env vars from
   dependencies weren't showing up to the build script by accident. This
   was an accidental regression from rust-lang#8969.
   
   The intention of rust-lang#8969 was to exclude connections to build scripts
   connected via dev-dependencies, but it only applied a heuristic because
   the unit graph doesn't retain information about dev-dependencies. The
   fix here is to instead actually retain information about
   dev-dependencies which is only used for constructing the unit graph and
   connecting build script executions to one another.
   
   Closes rust-lang#9063

   

   alexcrichton committed Jan 12, 2021
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