optimize: removed declaration of obsolete 'ngx_http_lua_inject_logby_ngx_api' function.

This function was removed in 5078b14.

Author: thibaultcha

src/ngx_http_lua_logby.h

@@ -14,7 +14,6 @@
 ngx_int_t ngx_http_lua_log_handler(ngx_http_request_t *r);
 ngx_int_t ngx_http_lua_log_handler_inline(ngx_http_request_t *r);
 ngx_int_t ngx_http_lua_log_handler_file(ngx_http_request_t *r);
-void ngx_http_lua_inject_logby_ngx_api(ngx_conf_t *cf, lua_State *L);
 
 
 #endif /* _NGX_HTTP_LUA_LOGBY_H_INCLUDED_ */