Add test for doing syscalls via "int $0"

This is a test for the fix in r165 (which fixed the 6th syscall
argument on x86-32).

BUG=none
TEST="make test"

Review URL: http://codereview.chromium.org/8727036

git-svn-id: http://seccompsandbox.googlecode.com/svn/trunk@179 55e79e8e-603c-11de-8c10-5fe6993ea61f
4 files changed