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bpf: don't catch the -1 syscall in the x32/x86_64 check

The -1 syscall can be used by a tracing process to skip a syscall,
which up until Linux v4.8 was of no concern for libseccomp since the
seccomp filter was only executed at the start of the syscall and not
after the tracing process was notified, however recent kernels also
execute the seccomp filter after the tracing process finishes its
syscall handling; this caused problems on x86_64 systems that didn't
explicitly add an x32 architecture to their filters.

This patch fixes the x32 check to treat the -1 syscall like any other
syscall.

Signed-off-by: Paul Moore <paul@paul-moore.com>
(imported from commit ba73ee4f5)

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