examples: fix path_tracing.v compilation, using (*ptr) = expression

vlib/hash/wyhash/rand.v

@@ -4,15 +4,12 @@
 module wyhash
 
 pub fn rand_u64(seed &u64) u64 {
-	// QTODO
-	/*
 	mut seed0 := seed
 	unsafe{
 		mut seed1 := *seed0
-		seed1+=wyp0
-		*seed0 = seed1
+		seed1 += (wyp0)
+		(*seed0) = seed1
 		return wymum(seed1^wyp1, seed1)
-	}
-	*/
+	}	
 	return 0
 }

vlib/hash/wyhash/wyhash_test.v

@@ -28,9 +28,7 @@ fn test_wyhash() {
 	}
 }
 
-fn test_rand_u64() {
-	// QTODO
-	/*
+fn test_rand_u64() {	
 	seed := u64(111)
 	mut rand_nos := []u64
 	for _ in 0..40 {
@@ -39,7 +37,6 @@ fn test_rand_u64() {
 			assert rand_no != r
 		}
 		rand_nos << rand_no
-	}
-	*/
+	}	
 	assert true
 }