Fixes build errors with external toolchains: [ 33%] Building C object CMakeFiles/cgi-io.dir/main.c.o /home/florian/dev/openwrt/trunk/build_dir/target-mipsel-unknown-linux-gnu_glibc/cgi-io/main.c:30:21: fatal error: libubus.h: No such file or directory #include <libubus.h> ^ compilation terminated. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>lilik-openwrt-22.03