If you're building your own packages, you could always try modifying the Makefile
and see if the patches still apply. From the openwrt-18.06
branch:
PKG_NAME:=tor
PKG_VERSION:=0.3.2.10
PKG_RELEASE:=1
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=https://dist.torproject.org/ \
https://archive.torproject.org/tor-package-archive
PKG_HASH:=60df77c31dcf94fdd686c8ca8c34f3b70243b33a7344ecc0b719d5ca2617cbee