pythongh-113536: Expose os.waitid on macOS

This API has been available on macOS for a long time, but was
explicitly excluded due to unspecified problems with the API
in ancient versions of macOS.

Misc/NEWS.d/next/macOS/2023-12-28-12-18-39.gh-issue-113536.0ythg7.rst

@@ -0,0 +1 @@
+`os.waitid` is now available on macOS

Modules/posixmodule.c

@@ -1023,7 +1023,7 @@ typedef struct {
     PyObject *TerminalSizeType;
     PyObject *TimesResultType;
     PyObject *UnameResultType;
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     PyObject *WaitidResultType;
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -2291,7 +2291,7 @@ static PyStructSequence_Desc statvfs_result_desc = {
     10
 };
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
 PyDoc_STRVAR(waitid_result__doc__,
 "waitid_result: Result from waitid.\n\n\
 This object may be accessed either as a tuple of\n\
@@ -2366,7 +2366,7 @@ _posix_clear(PyObject *module)
     Py_CLEAR(state->TerminalSizeType);
     Py_CLEAR(state->TimesResultType);
     Py_CLEAR(state->UnameResultType);
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     Py_CLEAR(state->WaitidResultType);
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -2391,7 +2391,7 @@ _posix_traverse(PyObject *module, visitproc visit, void *arg)
     Py_VISIT(state->TerminalSizeType);
     Py_VISIT(state->TimesResultType);
     Py_VISIT(state->UnameResultType);
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     Py_VISIT(state->WaitidResultType);
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -9517,7 +9517,7 @@ os_wait4_impl(PyObject *module, pid_t pid, int options)
 #endif /* HAVE_WAIT4 */
 
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
 /*[clinic input]
 os.waitid
 
@@ -9574,7 +9574,7 @@ os_waitid_impl(PyObject *module, idtype_t idtype, id_t id, int options)
 
     return result;
 }
-#endif /* defined(HAVE_WAITID) && !defined(__APPLE__) */
+#endif /* defined(HAVE_WAITID) */
 
 
 #if defined(HAVE_WAITPID)
@@ -17308,7 +17308,7 @@ posixmodule_exec(PyObject *m)
         return -1;
     }
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     waitid_result_desc.name = MODNAME ".waitid_result";
     state->WaitidResultType = (PyObject *)PyStructSequence_NewType(&waitid_result_desc);
     if (PyModule_AddObjectRef(m, "waitid_result", state->WaitidResultType) < 0) {