Win32: Use CRYPT_VERIFYCONTEXT for vlc_rand_bytes

Since we don't require access to persisted private keys

Manual cherry-pick of bf36bb29Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

src/misc/rand.c

@@ -154,7 +154,7 @@ void vlc_rand_bytes (void *buf, size_t len)
         NULL,              // Use default key container.
         MS_DEF_PROV,       // Use default CSP.
         PROV_RSA_FULL,     // Type of provider to acquire.
-        0) )
+        CRYPT_VERIFYCONTEXT) ) // Flag values
     {
         /* fill buffer with pseudo-random data, intial buffer content
            is used as auxillary random seed */