stdlib: include "Windows.h" before "Bcrypt.h"

The system header depends on Windows.h but does not include it itself.  This
results in base Windows types (e.g. ULONG) to be undefined.  Include the header
to include the needed typedefs.

Author: compnerd

stdlib/public/stubs/Random.cpp

@@ -19,6 +19,7 @@
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
 #include <Bcrypt.h>
 #pragma comment(lib, "Bcrypt.lib")
 #else