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

This reverts commit 2b1b7f8b135968cb88d8e65fcb89cdff8d203838.

Replaced by b5ca2161d9.

src/os/windows/win32.cpp

@@ -38,8 +38,6 @@
 
 #include "../../safeguards.h"
 
-bool _in_event_loop_post_crash;
-
 static bool _has_console;
 static bool _cursor_disable = true;
 static bool _cursor_visible = true;
@@ -102,7 +100,6 @@ bool LoadLibraryList(Function proc[], const char *dll)
 
 void ShowOSErrorBox(const char *buf, bool system)
 {
-	_in_event_loop_post_crash = true;
 	MyShowCursor(true);
 	MessageBox(GetActiveWindow(), OTTD2FS(buf), _T("Error!"), MB_ICONSTOP | MB_TASKMODAL);
 }