Change hash[T](seq[A]) to take varargs[A]

lib/pure/hashes.nim

@@ -126,6 +126,6 @@ proc hash*(x: float): THash {.inline.} =
   var y = x + 1.0
   result = cast[ptr THash](addr(y))[]
 
-proc hash*[A](x: seq[A]): THash =
+proc hash*[A](x: varargs[A]): THash =
   for it in items(x): result = result !& hash(it)
   result = !$result