Merge #1152 -- remove no op evdns functions

* upstream/pr/1152:
  dns: remove evdns_set_transaction_id_fn
  dns: remove evdns_set_random_bytes_fn

evdns.c

@@ -1595,17 +1595,6 @@ err:
 #undef GET8
 }
 
-
-void
-evdns_set_transaction_id_fn(ev_uint16_t (*fn)(void))
-{
-}
-
-void
-evdns_set_random_bytes_fn(void (*fn)(char *, size_t))
-{
-}
-
 /* Try to choose a strong transaction id which isn't already in flight */
 static u16
 transaction_id_pick(struct evdns_base *base) {

include/event2/dns.h

@@ -602,31 +602,6 @@ typedef void (*evdns_debug_log_fn_type)(int is_warning, const char *msg);
 EVENT2_EXPORT_SYMBOL
 void evdns_set_log_fn(evdns_debug_log_fn_type fn);
 
-/**
-   Set a callback that will be invoked to generate transaction IDs.  By
-   default, we pick transaction IDs based on the current clock time, which
-   is bad for security.
-
-   @param fn the new callback, or NULL to use the default.
-
-   NOTE: This function has no effect in Libevent 2.0.4-alpha and later,
-   since Libevent now provides its own secure RNG.
- */
-EVENT2_EXPORT_SYMBOL
-void evdns_set_transaction_id_fn(ev_uint16_t (*fn)(void));
-
-/**
-   Set a callback used to generate random bytes.  By default, we use
-   the same function as passed to evdns_set_transaction_id_fn to generate
-   bytes two at a time.  If a function is provided here, it's also used
-   to generate transaction IDs.
-
-   NOTE: This function has no effect in Libevent 2.0.4-alpha and later,
-   since Libevent now provides its own secure RNG.
-*/
-EVENT2_EXPORT_SYMBOL
-void evdns_set_random_bytes_fn(void (*fn)(char *, size_t));
-
 /*
  * Functions used to implement a DNS server.
  */