daemon: Fatal on XDP + egress gateway
daemon: Fatal on XDP + egress gateway

That combination of options is not currently supported and results in
the following datapath compilation error:

    In file included from bpf_xdp.c:38:
    /cilium/bpf/lib/nodeport.h:1108:20: error: no member named 'ifindex' in 'struct xdp_md'
                    if (info && ctx->ifindex != ENCAP_IFINDEX) {
                                ~~~  ^
    /cilium/bpf/lib/nodeport.h:1108:31: error: use of undeclared identifier 'ENCAP_IFINDEX'; did you mean 'CB_IFINDEX'?
                    if (info && ctx->ifindex != ENCAP_IFINDEX) {
                                                ^~~~~~~~~~~~~
                                                CB_IFINDEX
    /cilium/bpf/lib/common.h:599:2: note: 'CB_IFINDEX' declared here
            CB_IFINDEX,
            ^
    2 errors generated.
    make: *** [Makefile:188: bpf_xdp.ll] Error 1

Signed-off-by: Paul Chaignon <a027184a55211cd23e3f3094f1fdc728df5e0500@cilium.io>

michi-covalent/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,cilium/cilium