Add a note about needing 3.17+ for seccomp to work
Add a note about needing 3.17+ for seccomp to work

Add a note about needing Linux kernel 3.17+ for SCMP_FLTATR_CTL_TSYNC in
order for seccomp support to the message at startup about it not being
available.

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@digital-domain.net>

ac000/lehttpd