[NOTEPAD] Use _CrtSetDbgFlag to check memory leak (#5151)

We can borrow the power of CRT debug. These changes are effective for debug version only:
- Insert #include <crtdbg.h> at main.c.
- Call _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF) at the prologue of _tWinMain.
CORE-18837

base/applications/notepad/main.c

@@ -27,6 +27,10 @@
 #include <shlobj.h>
 #include <strsafe.h>
 
+#ifdef _DEBUG
+#include <crtdbg.h>
+#endif
+
 NOTEPAD_GLOBALS Globals;
 static ATOM aFINDMSGSTRING;
 
@@ -565,10 +569,14 @@ int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE prev, LPTSTR cmdline, int sh
     MONITORINFO info;
     INT x, y;
     RECT rcIntersect;
-
     static const TCHAR className[] = _T("Notepad");
     static const TCHAR winName[] = _T("Notepad");
 
+#ifdef _DEBUG
+    /* Report any memory leaks on exit */
+    _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
+#endif
+
     switch (GetUserDefaultUILanguage())
     {
     case MAKELANGID(LANG_HEBREW, SUBLANG_DEFAULT):