Fix AIX build in test/radix/quic_tests.c

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27354)

test/radix/quic_tests.c

@@ -7,6 +7,16 @@
  * https://www.openssl.org/source/license.html
  */
 
+#if defined(_AIX)
+/*
+ * Some versions of AIX define macros for events and revents for use when
+ * accessing pollfd structures (see Github issue #24236). That interferes
+ * with our use of these names here. We simply undef them.
+ */
+# undef revents
+# undef events
+#endif
+
 /*
  * Test Scripts
  * ============================================================================