python3: split out the Windows distutils installer stubs

Needing the Windows distutils installer stubs is quite a niche requirement, so
put them into a separate package and just recommend it.

This can save both space and legal pain, as the installers embed an old zlib
that has known CVEs.

(From OE-Core rev: 617331a42fc5bde0c2d8d0f4dd8df652daa28778)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3/python3-manifest.json

@@ -512,6 +512,16 @@
             "${libdir}/python${PYTHON_MAJMIN}/__pycache__/difflib.*.pyc"
         ]
     },
+    "distutils-windows": {
+        "cached": [],
+        "files": [
+            "${libdir}/python${PYTHON_MAJMIN}/distutils/command/wininst-*.exe"
+        ],
+        "rdepends": [
+            "distutils"
+        ],
+        "summary": "Python distribution utilities (Windows installer stubs)"
+    },
     "distutils": {
         "summary": "Python Distribution Utilities",
         "rdepends": [
@@ -789,6 +799,9 @@
             "xml",
             "xmlrpc"
         ],
+        "rrecommends": [
+            "distutils-windows"
+        ],
         "summary": "All Python modules"
     },
     "multiprocessing": {