Don't use Directory.Exists to check if a path is relative #11483
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Fixes #11482
Explanation, copied from the issue: RCLs don't have an absolute
BaseIntermediateOutputPath, so we end up seeing<current directory>\objas the obj path, and we have aDirectory.Existscheck that catches if that happens, and falls back to different logic for an RCL. Turns out current directory is the solution folder, and so sometimes that obj path does exist, but it exists for a different project, and then all sorts of fun shenanigans ensue.