* fhandler_clipboard.cc: new file

* Makefile.in: include fhandler_clipboard.o in DLL_OFILES list.
* fhandler.h: add FH_CLIPBOARD to the devices enum.
(fhandler_dev_clipboard): new
* path.cc (windows_device_names): add "\\dev\\clipboard"
(get_device_number): check for "clipboard"
* dcrt0.cc: declare a few more functions from winuser.h
* dtable.cc (dtable::build_fhandler): check for FH_CLIPBOARD in
switch().

winsup/cygwin/path.cc

@@ -431,6 +431,7 @@ const char *windows_device_names[] =
   "\\dev\\zero",
   "\\dev\\%srandom",
   "\\dev\\mem",
+  "\\dev\\clipboard",
 };
 
 static int
@@ -505,6 +506,8 @@ get_device_number (const char *name, int &unit, BOOL from_conv)
           devn = FH_MEM;
           unit = 1;
         }
+      else if (deveq ("clipboard"))
+        devn = FH_CLIPBOARD;
       else if (deveq ("port"))
         {
           devn = FH_MEM;