EVENT__SIZEOF_TIME_T does not exist on upstream libevent, see event-config.h.cmake

https://aur.archlinux.org/cgit/aur.git/commit/?h=firefox-wayland-hg&id=788a27ff6a4ee410f85f6c0f4b1ffa630213cfdc

--- seamonkey-2.53.15/ipc/chromium/src/base/message_pump_libevent.cc.orig	2023-01-21 20:11:38.565431875 +0300
+++ seamonkey-2.53.15/ipc/chromium/src/base/message_pump_libevent.cc	2023-01-21 20:11:57.836488596 +0300
@@ -40,7 +40,6 @@
 CHECK_EVENT_SIZEOF(PTHREAD_T, pthread_t);
 CHECK_EVENT_SIZEOF(SHORT,     short);
 CHECK_EVENT_SIZEOF(SIZE_T,    size_t);
-CHECK_EVENT_SIZEOF(TIME_T,    time_t);
 CHECK_EVENT_SIZEOF(VOID_P,    void*);
 
 // Lifecycle of struct event