strace improvement patch

[Roland McGrath]

Thanks, David.  That original patch was indeed by me.  I am now doing most
of the strace maintenance on the sourceforge version directly.  I was
already planning to merge those changes in, along with some more
clone-related changes I have to handle the 2.5 threads stuff that I will
finish up and merge.  I will incorporate your fixes and test it on IA64
before I commit those changes.