Make it compile

src/random.h

@@ -94,20 +94,12 @@ public:
     }
 };
 
-/* Number of random bytes returned by GetOSRand.
- * When changing this constant make sure to change all call sites, and make
- * sure that the underlying OS APIs for all platforms support the number.
- * (many cap out at 256 bytes).
- */
-static const ssize_t NUM_OS_RANDOM_BYTES = 32;
-
-/** Get 32 bytes of system entropy. Do not use this in application code: use
- * GetStrongRandBytes instead.
- */
-void GetOSRand(unsigned char *ent32);
-
-/** Check that OS randomness is available and returning the requested number
- * of bytes.
+/**
+ * MWC RNG of George Marsaglia
+ * This is intended to be fast. It has a period of 2^59.3, though the
+ * least significant 16 bits only have a period of about 2^30.1.
+ *
+ * @return random value
  */
 extern uint32_t insecure_rand_Rz;
 extern uint32_t insecure_rand_Rw;