remove never used macro

src/core/ngx_conf_file.h

diff --git a/src/core/ngx_conf_file.h b/src/core/ngx_conf_file.h
index 5957341..fd881e7 100644
--- a/src/core/ngx_conf_file.h
+++ b/src/core/ngx_conf_file.h
@@ -314,9 +314,6 @@
     }
 
 
-#define addressof(addr)  ((int) &addr)
-
-
 char *ngx_conf_param(ngx_conf_t *cf);
 char *ngx_conf_parse(ngx_conf_t *cf, ngx_str_t *filename);