Change foo (void) to foo () for all c++ functions throughout. Remove all

fhandler_*::dump functions throughout.
* fhandler.h (fhandler_dev_mem::close): Remove pass-through function in favor
of virtual method.
(handler_dev_raw::close): Ditto.
(fhandler_dev_clipboard::fixup_after_exec): New method.
* fhandler_dev_mem.cc (fhandler_dev_mem::close): Eliminate pass through
* fhandler_dev_raw.cc (fhandler_dev_raw::close): Ditto.
* fhandler_clipboard.cc (fhandler_dev_clipboard::close): Don't go to extra
effort when execing.
(fhandler_dev_clipboard::fixup_after_exec): New function.
* fhandler_console.cc (fhandler_console::close): Don't do "extra stuff" when we
know we're execing.
* fhandler_disk_file.cc (fhandler_disk_file::close): Ditto.
* fhandler_dsp.cc (fhandler_dev_dsp::close): Ditto.
* fhandler_fifo.cc (fhandler_fifo.cc::close): Ditto.  function in favor of base
function.
* fhandler_random.cc (fhandler_dev_random::close): Ditto.
* fhandler_registry.cc (fhandler_registry::close): Ditto.
* fhandler_tty.cc (fhandler_tty_slave::close): Ditto.
* fhandler_virtual.cc (fhandler_virtual::close): Ditto.
* pinfo.cc (proc_waiter): Remove unneeded hExeced declaration.
* sigproc.cc: Ditto.
* winsup.h (hExeced): Define here.
* fhandler_virtual.cc (fhandler_virtual::fixup_after_exec): Just call close()
to reinitialize things to known state.

winsup/cygwin/fhandler.cc

@@ -1249,12 +1249,6 @@ fhandler_base::init (HANDLE f, DWORD a, mode_t bin)
   debug_printf ("created new fhandler_base for handle %p, bin %d", f, rbinary ());
 }
 
-void
-fhandler_base::dump (void)
-{
-  paranoid_printf ("here");
-}
-
 int
 fhandler_base::dup (fhandler_base *child)
 {
@@ -1345,7 +1339,7 @@ fhandler_base::tcsendbreak (int)
 }
 
 int
-fhandler_base::tcdrain (void)
+fhandler_base::tcdrain ()
 {
   set_errno (ENOTTY);
   return -1;
@@ -1380,7 +1374,7 @@ fhandler_base::tcsetpgrp (const pid_t)
 }
 
 int
-fhandler_base::tcgetpgrp (void)
+fhandler_base::tcgetpgrp ()
 {
   set_errno (ENOTTY);
   return -1;
@@ -1414,7 +1408,7 @@ fhandler_base::fhandler_base () :
 }
 
 /* Normal I/O destructor */
-fhandler_base::~fhandler_base (void)
+fhandler_base::~fhandler_base ()
 {
   if (rabuf)
     free (rabuf);
@@ -1428,12 +1422,6 @@ fhandler_dev_null::fhandler_dev_null () :
 {
 }
 
-void
-fhandler_dev_null::dump (void)
-{
-  paranoid_printf ("here");
-}
-
 int
 fhandler_dev_null::open (int flags, mode_t mode)
 {