Fix Pypy3 Windows stdlib path

Signed-off-by: Bernát Gábor <bgabor8@bloomberg.net>

.pre-commit-config.yaml

@@ -30,7 +30,7 @@ repos:
   - id: blacken-docs
     additional_dependencies: [black==20.8b1]
 - repo: https://github.com/pre-commit/pygrep-hooks
-  rev: v1.7.1
+  rev: v1.8.0
   hooks:
   - id: rst-backticks
 - repo: https://github.com/tox-dev/tox-ini-fmt

docs/changelog/2071.bugfix.rst

@@ -0,0 +1 @@
+Fix PyPy3 stdlib on Windows is incorrect - by :user:`gaborbernat`.

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

@@ -17,14 +17,6 @@ class PyPy3(PyPy, Python3Supports):
     def exe_stem(cls):
         return "pypy3"
 
-    @property
-    def stdlib(self):
-        """
-        PyPy3 seems to respect sysconfig only for the host python...
-        virtual environments purelib is instead lib/pythonx.y
-        """
-        return self.dest / "lib" / "python{}".format(self.interpreter.version_release_str) / "site-packages"
-
     @classmethod
     def exe_names(cls, interpreter):
         return super(PyPy3, cls).exe_names(interpreter) | {"pypy"}
@@ -33,6 +25,11 @@ def exe_names(cls, interpreter):
 class PyPy3Posix(PyPy3, PosixSupports):
     """PyPy 2 on POSIX"""
 
+    @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"
+
     @classmethod
     def _shared_libs(cls):
         return ["libpypy3-c.so", "libpypy3-c.dylib"]
@@ -53,6 +50,11 @@ def sources(cls, interpreter):
 class Pypy3Windows(PyPy3, WindowsSupports):
     """PyPy 2 on Windows"""
 
+    @property
+    def stdlib(self):
+        """PyPy3 respects sysconfig only for the host python, virtual envs is instead Lib/site-packages"""
+        return self.dest / "Lib" / "site-packages"
+
     @property
     def bin_dir(self):
         """PyPy3 needs to fallback to pypy definition"""