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/Makefile b/src/Makefile
index 9eff349..5697c28 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1577,6 +1577,7 @@
 
 BASIC_SRC = \
 	arabic.c \
+	arglist.c \
 	autocmd.c \
 	beval.c \
 	blob.c \
@@ -1704,6 +1705,7 @@
 
 OBJ_COMMON = \
 	objects/arabic.o \
+	objects/arglist.o \
 	objects/autocmd.o \
 	objects/beval.o \
 	objects/buffer.o \
@@ -1844,6 +1846,7 @@
 
 PRO_AUTO = \
 	arabic.pro \
+	arglist.pro \
 	autocmd.pro \
 	blowfish.pro \
 	buffer.pro \
@@ -2989,6 +2992,9 @@
 objects/arabic.o: arabic.c
 	$(CCC) -o $@ arabic.c
 
+objects/arglist.o: arglist.c
+	$(CCC) -o $@ arglist.c
+
 objects/autocmd.o: autocmd.c
 	$(CCC) -o $@ autocmd.c
 
@@ -3476,6 +3482,10 @@
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
  proto.h globals.h
+objects/arglist.o: arglist.c vim.h protodef.h auto/config.h feature.h os_unix.h \
+ auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
+ proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
+ proto.h globals.h
 objects/autocmd.o: autocmd.c vim.h protodef.h auto/config.h feature.h os_unix.h \
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \