fix(build): include libbpf during libbpfgo compilation #450
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An issue appears when we try to compile libbpfgo on an older kernel that doesn't have the XDP_FLAGS_REPLACE defined in
/usr/include/linux/if_link.h. To overcome this, it is necessary to include the directory of libbpf under 3rdparty during the compilation, since install_uapi_headers doesn't install if_link.h.