softfail on older kernels that lack seccomp support

Attempt to set up a seccomp filter. If seccomp not supported
on an Android device and kernel version < 3.8 fail softly
i.e. allow process to run without seccomp protections.

Bug: 26435980
Change-Id: Ied6ac053908b6b0b81ba822621b1969bdedce4af
2 files changed