[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/filesystem/mkdir.cpp

@@ -0,0 +1,29 @@
+//
+// mkdir.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// The _mkdir() function, which creates a directory.
+//
+#include <corecrt_internal.h>
+#include <direct.h>
+#include <corecrt_internal_win32_buffer.h>
+
+// Creates a directory.  Returns 0 on success; returns -1 and sets errno and
+// _doserrno on failure.
+extern "C" int __cdecl _mkdir(char const* const path)
+{
+    if (path == nullptr) {
+        return _wmkdir(nullptr);
+    }
+
+    __crt_internal_win32_buffer<wchar_t> wide_path;
+
+    errno_t const cvt = __acrt_mbs_to_wcs_cp(path, wide_path, __acrt_get_utf8_acp_compatibility_codepage());
+
+    if (cvt != 0) {
+        return -1;
+    }
+
+    return _wmkdir(wide_path.data());
+}