Merge pull request #9 from PyO3/create-pull-request/patch

Update stable_abi.txt to the latest main

Author: ravenexp

Misc/stable_abi.txt

@@ -29,6 +29,8 @@
 #   value may change.
 # - typedef: A C typedef which is used in other definitions in the limited API.
 #   Its size/layout/signature must not change.
+# - ifdef: A feature macro: other items may be conditional on whether the macro
+#   is defined or not.
 
 # Each top-level item can have details defined below it:
 # - added: The version in which the item was added to the stable ABI.
@@ -41,6 +43,10 @@
 #     of the stable ABI.
 #   - a combination of the above (functions that were called by macros that
 #     were public in the past)
+# - doc: for `ifdef`, the blurb added in documentation
+# - windows: for `ifdef`, this macro is defined on Windows. (This info is used
+#   to generate the DLL manifest and needs to be available on all platforms.)
+#   `maybe` marks macros defined on some but not all Windows builds.
 
 # For structs, one of the following must be set:
 # - opaque: The struct name is available in the Limited API, but its members
@@ -59,6 +65,24 @@
 #    https://docs.python.org/3/c-api/stable.html#stable
 
 
+# Feature macros for optional functionality:
+
+ifdef MS_WINDOWS
+    doc on Windows
+    windows
+ifdef HAVE_FORK
+    doc on platforms with fork()
+ifdef USE_STACKCHECK
+    doc on platforms with USE_STACKCHECK
+    windows maybe
+ifdef PY_HAVE_THREAD_NATIVE_ID
+    doc on platforms with native thread IDs
+    windows
+ifdef Py_REF_DEBUG
+    doc when Python is compiled in debug mode (with Py_REF_DEBUG)
+    windows maybe
+
+
 # Mentioned in PEP 384:
 
 struct PyObject