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api: doc: tests: Add SCMP_ACT_TRAPX()

Add a new action macro, SCMP_ACT_TRAPX(), which accepts user-specified
data in the lower 16-bits.  When a userspace signal handler has been
specified, the Linux kernel populates the si_errno field in the siginfo
structure with these lower 16-bits from the trap action.

To maintain backward compatibility, redefine SCMP_ACT_TRAP to map to
SCMP_ACT_TRAPX(0).  This will guarantee that filters that utilize
SCMP_ACT_TRAP will behave identically.

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

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