Omitted erronous declaration of alloc_small_conf (which is static

in simple-cache.c).

src/server/memory.h

@@ -23,9 +23,6 @@ alloc_conference(void);
 extern Text_stat *
 alloc_text_stat(void);
 
-extern Small_conf *
-alloc_small_conf(void);
-
 extern void
 free_text_list(Text_list *text_list);