remove outdated code, fix stdlib path

docs/changelog/2182.bugfix.txt

@@ -1,2 +1,2 @@
-Fixed path collision that could lead to a PermissionError or writing to system
-directories when using PyPy3.8 - by :user:`mgorny`.
+Removed outdated PyPy-specific copy of prefix/lib contents, which breaks
+when using PyPy3.8 - by :user:`mgorny`.

src/virtualenv/create/via_global_ref/builtin/pypy/pypy3.py

@@ -28,7 +28,7 @@ class PyPy3Posix(PyPy3, PosixSupports):
     @property
     def stdlib(self):
         """PyPy3 respects sysconfig only for the host python, virtual envs is instead lib/pythonx.y/site-packages"""
-        return self.dest / "lib" / "python{}".format(self.interpreter.version_release_str) / "site-packages"
+        return self.dest / "lib" / "pypy{}".format(self.interpreter.version_release_str) / "site-packages"
 
     @classmethod
     def _shared_libs(cls):
@@ -37,17 +37,6 @@ def _shared_libs(cls):
     def to_lib(self, src):
         return self.dest / "lib" / src.name
 
-    @classmethod
-    def sources(cls, interpreter):
-        for src in super(PyPy3Posix, cls).sources(interpreter):
-            yield src
-        host_lib = Path(interpreter.system_prefix) / "lib"
-        if host_lib.exists() and host_lib.is_dir():
-            for path in host_lib.iterdir():
-                if path.is_dir():
-                    continue
-                yield PathRefToDest(path, dest=cls.to_lib)
-
 
 class Pypy3Windows(PyPy3, WindowsSupports):
     """PyPy 2 on Windows"""