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)

src/os_unix.c

@@ -61,6 +61,11 @@ static int selinux_enabled = -1;
 #  include <cygwin/version.h>
 #  include <sys/cygwin.h>	/* for cygwin_conv_to_posix_path() and/or
 				 * for cygwin_conv_path() */
+#  ifdef FEAT_CYGWIN_WIN32_CLIPBOARD
+#   define WIN32_LEAN_AND_MEAN
+#   include <windows.h>
+#   include "winclip.pro"
+#  endif
 # endif
 #endif
 
@@ -1223,6 +1228,9 @@ mch_init()
 #ifdef MACOS_CONVERT
     mac_conv_init();
 #endif
+#ifdef FEAT_CYGWIN_WIN32_CLIPBOARD
+    win_clip_init();
+#endif
 }
 
     static void