Disable epoll on illumos

--- percona-server-5.7.31-34/extra/libevent/libevent-2.1.11-stable/CMakeLists.txt.1	2020-10-08 22:14:00.038239787 +0000
+++ percona-server-5.7.31-34/extra/libevent/libevent-2.1.11-stable/CMakeLists.txt	2020-10-08 22:15:37.465107609 +0000
@@ -837,13 +837,13 @@
     list(APPEND SRC_CORE devpoll.c)
 endif()
 
-if(EVENT__HAVE_EPOLL)
-    list(APPEND SRC_CORE epoll.c)
-endif()
-
-if(EVENT__HAVE_EVENT_PORTS)
-    list(APPEND SRC_CORE evport.c)
-endif()
+#if(EVENT__HAVE_EPOLL)
+#    list(APPEND SRC_CORE epoll.c)
+#endif()
+
+#if(EVENT__HAVE_EVENT_PORTS)
+#    list(APPEND SRC_CORE evport.c)
+#endif()
 
 if (NOT EVENT__DISABLE_OPENSSL)
 #   SSL is configured in cmake/ssl.cmake
@@ -1202,9 +1202,9 @@
     # Add event backends based on system introspection result.
     set(BACKENDS "")
 
-    if (EVENT__HAVE_EPOLL)
-        list(APPEND BACKENDS EPOLL)
-    endif()
+#    if (EVENT__HAVE_EPOLL)
+#        list(APPEND BACKENDS EPOLL)
+#    endif()
 
     if (EVENT__HAVE_SELECT)
         list(APPEND BACKENDS SELECT)