patch 8.1.1869: code for the argument list is spread out

Problem:    Code for the argument list is spread out.
Solution:   Put argument list code in arglist.c. (Yegappan Lakshmanan,
            closes #4819)
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index c073b5f..eb6d696 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -703,6 +703,7 @@
 CUIOBJ = $(OUTDIR)/iscygpty.o
 OBJ = \
 	$(OUTDIR)/arabic.o \
+	$(OUTDIR)/arglist.o \
 	$(OUTDIR)/autocmd.o \
 	$(OUTDIR)/beval.o \
 	$(OUTDIR)/blob.o \