Fix ADB missing keystrokes problem Thanks, blargg! #14

- Add delay between scans to prevent overlaod of ADB keyboard controllers
- <http://geekhack.org/index.php?topic=14290.msg1068919#msg1068919>

converter/adb_usb/matrix.c

@@ -85,6 +85,7 @@ uint8_t matrix_scan(void)
     uint8_t key0, key1;
 
     is_modified = false;
+    _delay_ms(16);  // delay for preventing overload of poor ADB keyboard controller
     codes = adb_host_kbd_recv();
     key0 = codes>>8;
     key1 = codes&0xFF;