Port to Solaris 8.
Without this change, 'configure' fails because the recently-added wait3 prototype in config.h messes up later 'configure' tests. Fix this problem by droping wait3 and WRETCODE, as they're no longer needed on hosts that are current porting targets. * configure.ac (wait3, WRETCODE): Remove, fixing a FIXME. All uses changed to waitpid and WEXITSTATUS. * src/syswait.h (WRETCODE): Remove, consistently with ../configure.ac.
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