updated for version 7.3.836
Problem:    Clipboard does not work on Win32 when compiled with Cygwin.
Solution:   Move the Win32 clipboard code to a separate file and use it when
            building with os_unix.c. (Frodak Baksik, Ken Takata)
diff --git a/src/feature.h b/src/feature.h
index f2dcca2..434c07f 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1129,6 +1129,11 @@
  * +xterm_clipboard	Unix only: Include code for handling the clipboard
  *			in an xterm like in the GUI.
  */
+
+#ifdef FEAT_CYGWIN_WIN32_CLIPBOARD
+# define FEAT_CLIPBOARD
+#endif
+
 #ifdef FEAT_GUI
 # ifndef FEAT_CLIPBOARD
 #  define FEAT_CLIPBOARD