getrusage03: disable the test when kernel before 2.6.32

Kernel commit 1f10206c is first introduced in 2.6.32, this
ru_maxrss behaviors will not be supported before kernel 2.6.32,
so disable the test when kernel version is before 2.6.32.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>