Revert "Fix recursive faults in Window crash logger due to message box event loop."

This reverts commit 2b1b7f8b135968cb88d8e65fcb89cdff8d203838.

Replaced by b5ca2161d9.

src/openttd.h

@@ -51,20 +51,6 @@ extern GameMode _game_mode;
 extern SwitchMode _switch_mode;
 extern bool _exit_game;
 
-#if defined(WIN32)
-extern bool _in_event_loop_post_crash;
-
-inline bool InEventLoopPostCrash()
-{
-	return _in_event_loop_post_crash;
-}
-#else
-inline bool InEventLoopPostCrash()
-{
-	return false;
-}
-#endif
-
 /** Modes of pausing we've got */
 enum PauseMode : byte {
 	PM_UNPAUSED              = 0,      ///< A normal unpaused game