Fix resolution of direct url subdependencies

- Fix resolution of direct url VCS subdependencies (e.g. top level dep
  depends on a VCS direct url subdependency) which rely on subdirectory
  resolution
- Fixes #3976

Signed-off-by: Dan Ryan <dan.ryan@canonical.com>

news/3976.bugfix.rst

@@ -0,0 +1 @@
+Fixed a bug which prevented resolution of direct URL dependencies which have PEP508 style direct url VCS sub-dependencies with subdirectories.

pipenv/utils.py

@@ -997,6 +997,8 @@ class Resolver(object):
         for req, ireq in reqs:
             if (req.vcs and req.editable and not req.is_direct_url):
                 continue
+            elif req.normalized_name in self.skipped.keys():
+                continue
             collected_hashes = self.collect_hashes(ireq)
             req = req.add_hashes(collected_hashes)
             if not collected_hashes and self._should_include_hash(ireq):