PATCH: Fork event updates, part the fourth

[Andrew Cagney]

> This patch removes the infrun hackery expecting two TARGET_WAITKIND_FORKED
> events.  Instead it modifies the hppah-nat child_wait function to return
> only the interesting fork event.  This uses TARGET_WAITKIND_IGNORE, which is
> like TARGET_WAITKIND_SPURIOUS but does not trigger a resume.  A logical
> followup patch will probably rename both SPURIOUS and IGNORE, since I kept
> getting them confused while I was doing this.  I updated the comments on
> TARGET_WAITKIND_IGNORE since it isn't only used for the evil remote-async
> output packets now.

Just FYI,

A correctly written (event driven) remote.c would be generating these 
continuously.

Andrew