clone: increase stack size to 1M

16k is not enough for some LTP signal handlers:
http://article.gmane.org/gmane.linux.ltp/16992
1M should be plenty for all architectures.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
1 file changed