* Makefile.am, configure.ac: Add a test to exercise an odd case in _POSIX_signals_Clear_signals. * psxsignal05/.cvsignore, psxsignal05/Makefile.am, psxsignal05/init.c, psxsignal05/psxsignal05.doc, psxsignal05/psxsignal05.scn: New files.