Restore former Test_RandomNumberGenerator behavior

There's no need to special case for HURD. No one uses it

validat3.cpp

@@ -429,15 +429,8 @@ bool Test_RandomNumberGenerator(RandomNumberGenerator& prng, bool drain=false)
 		RandomNumberSource(prng, UINT_MAX, true, new Redirector(TheBitBucket()));
 	}
 
-	// Use a block that is zero'd to catch bad RNG's that appear [somewhat]
-	// OK due to entropy in the heap. We found Debian HURD was failing, but
-	// not that badly. For example, we would see "100000 generated bytes
-	// compressed to 98749 bytes by DEFLATE".
-	SecByteBlock block(NULLPTR, GENERATE_SIZE);
-	RandomNumberSource(prng, GENERATE_SIZE, true, new ArraySink(block, GENERATE_SIZE));
-
 	MeterFilter meter(new Redirector(TheBitBucket()));
-	StringSource(block, block.size(), true, new Deflator(new Redirector(meter)));
+	RandomNumberSource(prng, GENERATE_SIZE, true, new Deflator(new Redirector(meter)));
 
 	if (meter.GetTotalBytes() < GENERATE_SIZE)
 	{