Ausam/sys/ignores

Find at most related files.
including files from this version of Unix. 
proc.h:41:#ifdef	IGNORE_SIGNALS
proc.h:43:#endif	IGNORE_SIGNALS
pzomb.h:42:#ifdef	IGNORE_SIGNALS
pzomb.h:44:#endif	IGNORE_SIGNALS
ken/sig.c:82:#ifdef	IGNORE_SIGNALS
ken/slp.c:833:#ifdef	IGNORE_SIGNALS
ken/slp.c:835:#endif	IGNORE_SIGNALS
ken/sys1.c:248:#ifdef	IGNORE_SIGNALS
ken/sys1.c:250:#endif	IGNORE_SIGNALS
ken/sys4.c:306:#ifdef	IGNORE_SIGNALS