gh-110109: Fix installed buildbots now `pathlib` is a package (#112901)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 6ca11f080dcc3f14494a1267b99a10897645ae61..42a7545be7e66640e2a37177230043e68b35c812 100644 (file)
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2164,6 +2164,7 @@ LIBSUBDIRS=       asyncio \
                json \
                logging \
                multiprocessing multiprocessing/dummy \
+               pathlib \
                pydoc_data \
                re \
                site-packages \