[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/misc/debug_fill_threshold.cpp

@@ -0,0 +1,29 @@
+//
+// debug_fill_threshold.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// Functions to control the debug fill threshold used by the secure string
+// functions.  A threshold of 0 disables filling; a threshold of SIZE_MAX
+// means to always fill to the maximum.
+//
+#include <corecrt_internal.h>
+#include <stdint.h>
+
+
+
+static size_t __acrt_debug_fill_threshold = SIZE_MAX;
+
+
+
+extern "C" size_t __cdecl _CrtSetDebugFillThreshold(size_t const new_threshold)
+{
+    size_t const old_threshold{__acrt_debug_fill_threshold};
+    __acrt_debug_fill_threshold = new_threshold;
+    return old_threshold;
+}
+
+extern "C" size_t __cdecl _CrtGetDebugFillThreshold()
+{
+    return __acrt_debug_fill_threshold;
+}