eliminate old unused typedef

src/core/ngx_hash.h

diff --git a/src/core/ngx_hash.h b/src/core/ngx_hash.h
index da8b7e0..5435324 100644
--- a/src/core/ngx_hash.h
+++ b/src/core/ngx_hash.h
@@ -79,18 +79,6 @@
 
 
 typedef struct {
-    void            **buckets;
-    ngx_uint_t        hash_size;
-
-    ngx_uint_t        max_size;
-    ngx_uint_t        bucket_limit;
-    size_t            bucket_size;
-    char             *name;
-    ngx_uint_t        min_buckets;
-} ngx_hash0_t;
-
-
-typedef struct {
     ngx_uint_t        hash;
     ngx_str_t         key;
     ngx_str_t         value;