crypto/rand/rand_win.c: include "e_os.h" to get the default _WIN32_WINNT
This helps decide if the BCrypt API should be used or not.
Fixes
#include <openssl/rand.h>
#include "rand_lcl.h"
#include "internal/rand_int.h"
+#include "e_os.h" /* For a default _WIN32_WINNT */
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
# ifndef OPENSSL_RAND_SEED_OS
