patch 8.1.1318: code for text changes is in a "misc" file

Problem:    Code for text changes is in a "misc" file.
Solution:   Move the code to change.c.
diff --git a/src/Makefile b/src/Makefile
index 10ba875..e50438c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1576,6 +1576,7 @@
 	blob.c \
 	blowfish.c \
 	buffer.c \
+	change.c \
 	charset.c \
 	crypt.c \
 	crypt_zip.c \
@@ -1691,6 +1692,7 @@
 	objects/autocmd.o \
 	objects/beval.o \
 	objects/buffer.o \
+	objects/change.o \
 	objects/blob.o \
 	objects/blowfish.o \
 	objects/crypt.o \
@@ -1821,6 +1823,7 @@
 	autocmd.pro \
 	blowfish.pro \
 	buffer.pro \
+	change.pro \
 	charset.pro \
 	crypt.pro \
 	crypt_zip.pro \
@@ -2965,6 +2968,9 @@
 objects/buffer.o: buffer.c
 	$(CCC) -o $@ buffer.c
 
+objects/change.o: change.c
+	$(CCC) -o $@ change.c
+
 objects/charset.o: charset.c
 	$(CCC) -o $@ charset.c
 
@@ -3430,6 +3436,10 @@
  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 version.h
+objects/change.o: change.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 version.h
 objects/charset.o: charset.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 \