selftests/bpf: Fix xdp_synproxy build failure if CONFIG_NF_CONNTRACK=m/n

When CONFIG_NF_CONNTRACK=m, struct bpf_ct_opts and enum member
BPF_F_CURRENT_NETNS are not exposed. This commit allows building the
xdp_synproxy selftest in such cases. Note that nf_conntrack must be
loaded before running the test if it's compiled as a module.

This commit also allows this selftest to be successfully compiled when
CONFIG_NF_CONNTRACK is disabled.

One unused local variable of type struct bpf_ct_opts is also removed.

Fixes: fb5cd0ce70d4 ("selftests/bpf: Add selftests for raw syncookie helpers")
Reported-by: Yauheni Kaliuta <[email protected]>
Signed-off-by: Maxim Mikityanskiy <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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