patches/openwrt: build: fix argument list too long
We updated all our build servers to Debian Buster, but LuCI is not compiled. It ends up with following error: make[2]: execvp: /usr/bin/env: Argument list too long
I found that there are patches on mailing list of OpenWrt-devel [1]. They were not reviewed neither applied since February. Let's apply them to see if it it works.
[1] https://patchwork.ozlabs.org/project/openwrt/list/?series=159823