Fix pthread_attr_setstacksize failure
Fix pthread_attr_setstacksize failure

PTHREAD_STACK_MIN is 128K on powerpc 64bit environment. We should pass
at least PTHREAD_STACK_MIN. Also make this failure a non-fatal as we
should still be able to create threads with default stack size.

Signed-off-by: Matt Benjamin <b5ea062884a8f3dc969ff57d1008615447c56296@redhat.com>

sswen/ntirpc,sswen/ntirpc