getrusage is used in a number of places throughout the qemu codebase
(notably, in crypto/pbkdf.c).  Without this syscall being whitelisted,
qemu ends up getting killed by the kernel whenever you try to connect to
a VNC console.
Signed-off-by: NBrian Rak <brak@gameservers.com>
Acked-by: NEduardo Otubo <eduardo.otubo@profitbricks.com>