all: remove deprecated sys_errlist[] and replace with ANSI C strerror()

cde/programs/dtcm/dtcm/dnd.c

@@ -72,10 +72,6 @@
 
 static Bool lookForButton(Display *, XEvent *, XPointer);
 
-#if !defined(__linux__) && !defined(CSRG_BASED)
-extern char	*sys_errlist[];
-#endif
-
 extern int	drag_load_proc(char*, Calendar *);
 static char	dnd_filename[20];
 

cde/programs/dtcm/libDtCmP/util.c

@@ -306,10 +306,7 @@ syserr(char *msg, int a1, int a2, int a3)
 #if 0
 	/* print the error, if any */
 	if (saveerr != 0) {
-		if (saveerr < 0 || saveerr > sys_nerr) 
-			(void) fprintf(stderr, ":Unknown error %d", saveerr);
-		else 
-			(void) fprintf(stderr, ":%s", sys_errlist[saveerr]);
+			(void) fprintf(stderr, ":%s", strerror(saveerr));
 	}
 #endif