* globals.cc (exit_status): Add new ES_EXIT_STARTING enum.

* dcrt0.cc (cygwin_exit): Set exit_state to ES_EXIT_STARTING prior to calling
real exit.
* dll_init.cc (dll_list::detach): Remove dll from linked list and call
destructors even if exiting.  Don't call __cxa_finalize in exiting case.

winsup/cygwin/dcrt0.cc

@@ -1127,6 +1127,7 @@ cygwin_atexit (void (*fn) (void))
 extern "C" void
 cygwin_exit (int n)
 {
+  exit_state = ES_EXIT_STARTING;
   exit (n);
 }