Implement Windows release builds in Azure Pipelines (GH-14065)

Includes backported fixes from GH-14091

PC/layout/support/pip.py

@@ -11,15 +11,11 @@ import shutil
 import subprocess
 import sys
 
-__all__ = []
+from .filesets import *
+
+__all__ = ["extract_pip_files", "get_pip_layout"]
 
 
-def public(f):
-    __all__.append(f.__name__)
-    return f
-
-
-@public
 def get_pip_dir(ns):
     if ns.copy:
         if ns.zip_lib:
@@ -29,10 +25,23 @@ def get_pip_dir(ns):
         return ns.temp / "packages"
 
 
-@public
+def get_pip_layout(ns):
+    pip_dir = get_pip_dir(ns)
+    if not pip_dir.is_dir():
+        log_warning("Failed to find {} - pip will not be included", pip_dir)
+    else:
+        pkg_root = "packages/{}" if ns.zip_lib else "Lib/site-packages/{}"
+        for dest, src in rglob(pip_dir, "**/*"):
+            yield pkg_root.format(dest), src
+        yield "pip.ini", ("pip.ini", b"[global]\nuser=yes")
+
+
 def extract_pip_files(ns):
     dest = get_pip_dir(ns)
-    dest.mkdir(parents=True, exist_ok=True)
+    try:
+        dest.mkdir(parents=True, exist_ok=False)
+    except IOError:
+        return
 
     src = ns.source / "Lib" / "ensurepip" / "_bundled"
 
@@ -58,6 +67,7 @@ def extract_pip_files(ns):
             "--target",
             str(dest),
             "--no-index",
+            "--no-compile",
             "--no-cache-dir",
             "-f",
             str(src),