patch newly occuring test failure where the base_dir does not contain the subdirectory.

pipenv/vendor/requirementslib/models/setup_info.py

@@ -13,7 +13,7 @@ import sys
 from collections.abc import Iterable, Mapping
 from functools import lru_cache, partial
 from pathlib import Path
-from urllib.parse import urlparse, urlunparse
+from urllib.parse import urlparse, urlunparse, parse_qs
 from weakref import finalize
 
 import pipenv.vendor.attr as attr
@@ -1230,8 +1230,15 @@ build-backend = "{1}"
                 )
             )
             need_delete = True
+
+        parsed = urlparse(str(self.ireq.link))
+        subdir = parse_qs(parsed.fragment).get('subdirectory', [])
+        if subdir:
+            directory = f"{self.base_dir}/{subdir[0]}"
+        else:
+            directory = self.base_dir
         result = build_pep517(
-            self.base_dir,
+            directory,
             self.extra_kwargs["build_dir"],
             config_settings=self.pep517_config,
             dist_type="wheel",