* sigproc.cc (sigCONT): Define.

* sigproc.h (sigCONT): Declare.
(wait_sig): Create sigCONT event here.
* exceptions.cc (sig_handle_tty_stop): Wait for sigCONT event rather than
stopping thread.
(sig_handle): Set sigCONT event as appropriate on SIGCONT rather than calling
ResumeThread.

winsup/cygwin/sigproc.h

@@ -95,6 +95,7 @@ public:
 
 extern sigthread mainthread;
 extern HANDLE signal_arrived;
+extern HANDLE sigCONT;
 
 BOOL __stdcall my_parent_is_alive ();
 extern "C" int __stdcall sig_dispatch_pending (int force = FALSE);