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Compiling a debug build in the chromeos chroot fails because
we can't link libseccomp_bpf_helpers.so. The failure occurs
because both seccomp_bpf and seccomp_bpf_helpers use
SANDBOX_EXPORT but are in different components and so the
symbols are visible but undefined in some circumstances.

BUG=None
TEST=Build

Review-Url: https://codereview.chromium.org/2291783002
Cr-Commit-Position: refs/heads/master@{#415208}