add seccomp syscall fallbacks

Some of the android prebuilts use linux 3.2.14 which don't include the
seccomp syscall define.  Add some fallbacks for the main arches we have
support for in android.  The rest we'll force to update.

Bug: None
Test: build passes for host
Change-Id: I00bd3aeaed7df32cc28aee9ccd0172a1d0bd2a6c
1 file changed