On 2.4 hosts signals are delivered in numeric order when there are multiple
pending at a given time.  UML developed a subtle dependency on this
ordering, which broke on 2.6 hosts and the separate process and thread
signal queues.

This patch eliminates that dependency.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>