Function build_dir_remap 

fn build_dir_remap(build_runner: &BuildRunner<'_, '_>) -> (PathBuf, String)

Remap all paths pointing to build.build-dir, i.e., [BUILD_DIR]/debug/deps/foo-[HASH].dwo would be remapped to /cargo/build-dir/debug/deps/foo-[HASH].dwo (note the /cargo/build-dir prefix).

This covers scenarios like:

• Build script generated code. For example, a build script may call file! macros, and the associated crate uses include! to include the expanded file! macro in-place via the OUT_DIR environment.
• On Linux, DW_AT_GNU_dwo_name that contains paths to split debuginfo files (dwp and dwo).