[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/getpid.cpp

@@ -0,0 +1,16 @@
+//
+// getpid.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// The _getpid() function, which gets the current process identifier.
+//
+#include <corecrt_internal.h>
+
+
+
+// Gets the current process identifier.
+extern "C" int __cdecl _getpid()
+{
+    return GetCurrentProcessId();
+}