[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/heap/heapchk.cpp

@@ -0,0 +1,21 @@
+//
+// heapchk.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// Implementation of _heapchk().
+//
+#include <corecrt_internal.h>
+#include <malloc.h>
+
+// Performs a consistency check on the heap.  The return value is one of the
+// following:
+//  * _HEAPOK       The validation of the heap completed successfully
+//  * _HEAPBADNODE  Some node in the heap is malformed and the heap is corrupt
+extern "C" int __cdecl _heapchk()
+{
+    if (!HeapValidate(__acrt_heap, 0, nullptr))
+        return _HEAPBADNODE;
+
+    return _HEAPOK;
+}