* cygthread.cc (cygthread::detach): Fix debugging output.

* dcrt0.cc (dll_crt0_1): Create signal_arrived early -- before any filename
manipulation.
* sigproc.cc (sigproc_init): Don't create signal_arrived here.
* fork.cc (fork_child): Ditto.

winsup/cygwin/dcrt0.cc

@@ -743,6 +743,8 @@ dll_crt0_1 (char *)
   strace.microseconds ();
 #endif
 
+  create_signal_arrived ();
+
   /* Initialize debug muto, if DLL is built with --enable-debugging.
      Need to do this before any helper threads start. */
   debug_init ();