htobe64 usage requires including endian.h, otherwise tc-tiny fails to build.
Fixes: 6262366381 ("iproute2: update to 6.11.0")
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16609
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>