Add support for SCMP_FLTATR_CTL_WAITKILL, test against libseccomp v2.6.0 #114
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1. Add support for SCMP_FLTATR_CTL_WAITKILL
Introduce (*ScmpFilter).GetWaitKill and (*ScmpFilter).SetWaitKill
methods, together with the documentation and trivial tests.
The functionality appears in libseccomp v2.6.0 and requires API Level 7.
2. ci: add seccomp 2.5.6 and 2.6.0
Those were released recently: