examples,tools: cleanup most warnings

examples/hanoi.v

@@ -8,7 +8,7 @@ fn main() {
 }
 
 fn move(n int, a string, b string) int {
-	println('Disc $n from $a to $b\...')
+	println('Disc $n from $a to ${b}...')
 	return 0
 }
 

examples/net_raw_http.v

@@ -1,6 +1,5 @@
 // Simple raw HTTP head request
 import net
-import time
 import io
 
 // Make a new connection