xdp: warn when using XDP emulation

Vladimír Čunátrequested to merge
xdp-emulation into master

For simplicity we build Knot version required for using XDP. In current CI this turns off XDP support.

Syntax: I found no better way to split the line; alternative: backslash in meson >= 0.50.

Edited by Petr Špaček

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