[packages] tinyproxy: update to 1.8.3

Signed-off-by: Jonh Wendell <jonh.wendell@oiwifi.com.br>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@37670 3c298f89-4303-0410-b956-a3cf2f4a3e73