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api: doc: tests: Add SCMP_ACT_TRAPX()

In Issue 466 [1], github user @RocketMaDev pointed out that libseccomp
currently does not support the 16-bit "reason" field in the
SCMP_ACT_TRAP action.  When a seccomp filter in the kernel results in a
TRAP action, the lower 16 bits of the TRAP action are populated in the
si_errno field of the siginfo structure.

Add a new action macro, SCMP_ACT_TRAPX(), which accepts user-specified
data in the lower 16-bits.  To maintain backward compatibility, redefine
SCMP_ACT_TRAP to map to SCMP_ACT_TRAPX(0).

[1] https://github.com/seccomp/libseccomp/issues/466

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

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