libutil: Drop unused SubdirSourceAccessor

Author: xokdvium

src/libutil/include/nix/util/source-accessor.hh

@@ -241,10 +241,4 @@ ref<SourceAccessor> makeFSSourceAccessor(std::filesystem::path root);
  */
 ref<SourceAccessor> makeUnionSourceAccessor(std::vector<ref<SourceAccessor>> && accessors);
 
-/**
- * Creates a new source accessor which is confined to the subdirectory
- * of the given source accessor.
- */
-ref<SourceAccessor> projectSubdirSourceAccessor(ref<SourceAccessor>, CanonPath subdirectory);
-
 } // namespace nix

src/libutil/meson.build

@@ -156,7 +156,6 @@ sources = [ config_priv_h ] + files(
   'source-accessor.cc',
   'source-path.cc',
   'strings.cc',
-  'subdir-source-accessor.cc',
   'suggestions.cc',
   'tarfile.cc',
   'tee-logger.cc',