patch 8.1.1076: file for Insert mode is much too big

Problem:    File for Insert mode is much too big.
Solution:   Split off the code for Insert completion. (Yegappan Lakshmanan,
            closes #4044)
diff --git a/src/Make_manx.mak b/src/Make_manx.mak
index 2cbc3df..d150e4b 100644
--- a/src/Make_manx.mak
+++ b/src/Make_manx.mak
@@ -61,6 +61,7 @@
 	hardcopy.c \
 	hashtab.c \
 	indent.c \
+	insexpand.c \
 	json.c \
 	list.c \
 	main.c \
@@ -122,6 +123,7 @@
 	obj/hardcopy.o \
 	obj/hashtab.o \
 	obj/indent.o \
+	obj/insexpand.o \
 	obj/json.o \
 	obj/list.o \
 	obj/main.o \
@@ -181,6 +183,7 @@
 	proto/hardcopy.pro \
 	proto/hashtab.pro \
 	proto/indent.pro \
+	proto/insexpand.pro \
 	proto/json.pro \
 	proto/list.pro \
 	proto/main.pro \
@@ -335,6 +338,9 @@
 obj/indent.o:	indent.c
 	$(CCSYM) $@ indent.c
 
+obj/insexpand.o:	insexpand.c
+	$(CCSYM) $@ insexpand.c
+
 obj/json.o:	json.c
 	$(CCSYM) $@ json.c