Update the shipped c-ares to 1.31.0 and silence deprecation warnings for c-ares API.

Ignore these for entire src/dns.c.
Quoting https://github.com/c-ares/c-ares/pull/732#issuecomment-2028454381:
"Those deprecated functions will remain available until there is an ABI
 break, which honestly will likely never happen. It's more to encourage
 integrators to move to the more modern functions."
Also, keep in mind that several of these 'deprecations' happened in early 2024
while the new function was introduced in March 2020, like for ares_getaddrinfo().
That isn't all that long ago, only 4 years. So we would need compatibility code
for both the old and new function for a while.
So: we can look into that in some major new UnrealIRCd version, nothing urgent,
and perhaps by then it is long enough that we don't need the fallback to older
functions.

configure

@@ -8480,7 +8480,7 @@ fi
 if test "$has_system_cares" = "no"
 then :
 
-cares_version="1.19.1"
+cares_version="1.31.0"
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: extracting c-ares resolver library" >&5
 printf "%s\n" "extracting c-ares resolver library" >&6; }
 cur_dir=`pwd`

configure.ac

@@ -757,9 +757,7 @@ AS_IF([test "x$PRIVATELIBDIR" != "x"], [rm -f "$PRIVATELIBDIR/"libcares*])],[has
 
 AS_IF([test "$has_system_cares" = "no"], [
 dnl REMEMBER TO CHANGE WITH A NEW C-ARES RELEASE!
-dnl NOTE: when changing this here, ALSO change it in extras/curlinstall
-dnl       and in the comment in this file around line 400!
-cares_version="1.19.1"
+cares_version="1.31.0"
 AC_MSG_RESULT(extracting c-ares resolver library)
 cur_dir=`pwd`
 cd extras

doc/RELEASE-NOTES.md

@@ -19,9 +19,11 @@ in progress and may not always be a stable version.
 * IRCOps with the operclass `locop` can now only `REHASH` the local server
   and not remote servers.
 * Comment out some more in example.conf by default
+* Update shipped libraries: c-ares to 1.31.0
 
 ### Fixes:
-* TODO
+* Silence some compiler warnings regarding deprecation of c-ares API in
+  src/dns.c.
 
 ### Developers and protocol:
 * TODO

src/dns.c

@@ -33,6 +33,23 @@
  #error "You have an old c-ares version on your system and/or Unreals c-ares failed to compile!"
 #endif
 
+#if defined(__GNUC__)
+/* Ignore these for this entire file.
+ * Quoting https://github.com/c-ares/c-ares/pull/732#issuecomment-2028454381:
+ * "Those deprecated functions will remain available until there is an ABI
+ *  break, which honestly will likely never happen. It's more to encourage
+ *  integrators to move to the more modern functions."
+ * Also, keep in mind that several of these 'deprecations' happened in early 2024
+ * while the new function was introduced in March 2020, like for ares_getaddrinfo().
+ * That isn't all that long ago, only 4 years. So we would need compatibility code
+ * for both the old and new function for a while.
+ * So: we can look into that in some major new UnrealIRCd version, nothing urgent,
+ * and perhaps by then it is long enough that we don't need the fallback to older
+ * functions.
+ */
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 /* Forward declerations */
 void unrealdns_cb_iptoname(void *arg, int status, int timeouts, struct hostent *he);
 void unrealdns_cb_nametoip_verify(void *arg, int status, int timeouts, struct hostent *he);