Make it possible to vendor this package #4
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This fixes two problems that were preventing this package from working when vendored inside another dune project:
Replace workspace_root with project_root in dune file. When a package is vendored inside another project, workspace_root is the top-level directory for the entire project whereas project_root is the vendored source directory for this package.
Pass the path to the cppo binary to discover.exe. If cppo is vendored and not globally installed, dune can locate it (e.g. %{bin:cppo} in a dune file) but running "cppo" won't work.