Remove workarounds for ancient kernels lacking __WALL

__WALL is available and working at least since 2.4 kernels: 10 years ago.

* strace (detach): Remove workarounds for ancient kernels lacking __WALL.
Add missing EINTR check.
(trace): Remove workarounds for ancient kernels lacking __WALL.
Remove redundant double error printout.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
1 file changed