Remove relative path

Author: virtuald

src/semiwrap/makeplan.py

@@ -609,7 +609,10 @@ def _locate_header(self, hdr: str, search_path: T.List[pathlib.Path]):
         for p in search_path:
             h_path = p / phdr
             if h_path.exists():
-                return InputFile(relpath_walk_up(h_path, self.project_root)), p
+                # We should return this as an InputFile, but inputs must be relative to the
+                # project root, which may not be the case on windows. Incremental build should
+                # still work, because the header is included in a depfile
+                return h_path, p
         raise FileNotFoundError(
             f"cannot locate {phdr} in {', '.join(map(str, search_path))}"
         )