Add '#include "cygwait.h"' throughout, where appropriate.

* DevNotes: Add entry cgf-000012.
* Makefile.in (DLL_OFILES): Add cygwait.o.
* sigproc.h: Remove cygwait definitions.
* cygwait.h: New file.  Define/declare Cygwin waitfor functions.
* cygwait.cc: Ditto.
* exceptions.cc: Include cygwait.h.
(handle_sigsuspend): Accommodate change in cancelable_wait arguments.
(sigpacket::process): Display thread tls in debugging output.
* fhandler.cc (fhandler_base_overlapped::wait_overlapped): Use symbolic names
for signal and cancel return.
* fhandler_console.cc (fhandler_console::read): Ditto.
(fhandler_dev_dsp::Audio_out::waitforspace): Ditto.
fhandler_dev_dsp::Audio_in::waitfordata): Ditto.
* fhandler_fifo.cc (fhandler_fifo::wait): Ditto.
* fhandler_serial.cc (fhandler_serial::raw_read): Ditto.
* fhandler_tty.cc (fhandler_pty_slave::read): Ditto.
* select.cc (cygwin_select): Ditto.
* wait.cc (wait4): Ditto.
* thread.cc (cancelable_wait): Move definition to cygwait.h.
(pthread_cond::wait): Accommodate change in cancelable_wait arguments.
(pthread_mutex::lock): Ditto.
(pthread_spinlock::lock): Ditto.
(pthread::join): Ditto.
(pthread::thread_init_wrapper): Display tls in debugging output.
(semaphore::_timedwait): Ditto.
* thread.h (cw_sig_wait): Move to cygwait.h.
(cw_cancel_action): Delete.
(cancelable_wait): Move declaration to cygwait.h.

winsup/cygwin/fhandler.cc

@@ -31,6 +31,7 @@ details. */
 #include "sigproc.h"
 #include "shared_info.h"
 #include <asm/socket.h>
+#include "cygwait.h"
 
 #define MAX_OVERLAPPED_WRITE_LEN (64 * 1024 * 1024)
 #define MIN_OVERLAPPED_WRITE_LEN (1 * 1024 * 1024)
@@ -1939,7 +1940,7 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
 	    case WAIT_OBJECT_0:
 	      err = ERROR_INVALID_HANDLE;
 	      break;
-	    case WAIT_OBJECT_0 + 1:
+	    case WAIT_SIGNALED:
 	      err = ERROR_INVALID_AT_INTERRUPT_TIME;
 	      break;
 	    default: