new ptrace_setoptions causes strace to sometimes dump core

[Mike Frysinger]

when testing things on ppc64, `make distcheck` failed because of a core file 
in the tests/ subdir.  playing with things, it seems that strace doesnt like 
it when you cut its pipe short.

the new ptrace_setoptions does just that though -- it calls fgrep with -q 
which causes fgrep to quite immediately upon a match.  and the match in 
question happens to be the first line.

perhaps drop the -q option, have fgrep redirect to /dev/null, and add a 
comment that the -q option cant be added back in ?
-mike
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