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_dice.mak b/src/Make_dice.mak
index 2025974..5bad80b 100644
--- a/src/Make_dice.mak
+++ b/src/Make_dice.mak
@@ -51,6 +51,7 @@
 	hardcopy.c \
 	hashtab.c \
 	indent.c \
+	insexpand.c \
 	json.c \
 	list.c \
 	main.c \
@@ -110,6 +111,7 @@
 	o/hardcopy.o \
 	o/hashtab.o \
 	o/indent.o \
+	o/insexpand.o \
 	o/json.o \
 	o/list.o \
 	o/main.o \
@@ -213,6 +215,8 @@
 
 o/indent.o:	indent.c  $(SYMS)
 
+o/insexpand.o:	insexpand.c  $(SYMS)
+
 o/json.o:	json.c  $(SYMS)
 
 o/list.o:	list.c  $(SYMS)