lua: do a binary-and operation in is_flag_set()

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

share/lua/intf/modules/host.lua

@@ -68,7 +68,14 @@ status = { init = 0, read = 1, write = 2, password = 3 }
 client_type = { net = 1, stdio = 2, fifo = 3, telnet = 4 }
 
 function is_flag_set(val, flag)
-    return (((val - (val % flag)) / flag) % 2 ~= 0)
+    local bit = 65536
+    while bit > 1 do
+        val = val % bit
+        flag = flag % bit
+        bit = bit / 2
+        if val >= bit and flag >= bit then return true end
+    end
+    return false
 end
 
 function host()