rogue4: fix most GCC5 warnings.

Converting all function definitions to ANSI style accounts for most of
the change.  This has exposed other problems, such as daemons not
actually being their stated type, that will require more careful
solutions.

rogue4/scrolls.c

@@ -18,7 +18,8 @@
  * read_scroll:
  *	Read a scroll from the pack and do the appropriate thing
  */
-read_scroll()
+void
+read_scroll(void)
 {
     register THING *obj;
     register int y, x;