patch 8.1.1039: MS-Windows build fails

Problem:    MS-Windows build fails.
Solution:   Remove dependency on arabic.h
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 0587b4d..98210c1 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -1004,7 +1004,7 @@
 	$(MAKE) -C tee clean
 
 ###########################################################################
-INCL =	vim.h alloc.h arabic.h ascii.h ex_cmds.h feature.h globals.h \
+INCL =	vim.h alloc.h ascii.h ex_cmds.h feature.h globals.h \
 	keymap.h macros.h option.h os_dos.h os_win32.h proto.h regexp.h \
 	spell.h structs.h term.h beval.h $(NBDEBUG_INCL)
 GUI_INCL = gui.h