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/Make_ming.mak

@@ -523,6 +523,7 @@ OBJ = \
 	$(OUTDIR)/option.o \
 	$(OUTDIR)/os_win32.o \
 	$(OUTDIR)/os_mswin.o \
+	$(OUTDIR)/winclip.o \
 	$(OUTDIR)/pathdef.o \
 	$(OUTDIR)/popupmnu.o \
 	$(OUTDIR)/quickfix.o \