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/Make_vms.mms b/src/Make_vms.mms
index e25e426..3c41cc0 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -2,7 +2,7 @@
 # Makefile for Vim on OpenVMS
 #
 # Maintainer:   Zoltan Arpadffy <arpadffy@polarhome.com>
-# Last change:  2019 Apr 26
+# Last change:  2019 May 11
 #
 # This has script been tested on VMS 6.2 to 8.2 on DEC Alpha, VAX and IA64
 # with MMS and MMK
@@ -307,7 +307,7 @@
 ALL_LIBS = $(LIBS) $(GUI_LIB_DIR) $(GUI_LIB) \
 	   $(PERL_LIB) $(PYTHON_LIB) $(TCL_LIB) $(RUBY_LIB)
 
-SRC =	arabic.c autocmd.c beval.c blob.c blowfish.c buffer.c charset.c \
+SRC =	arabic.c autocmd.c beval.c blob.c blowfish.c buffer.c change.c, charset.c \
 	crypt.c crypt_zip.c debugger.c dict.c diff.c digraph.c edit.c eval.c \
 	evalfunc.c ex_cmds.c ex_cmds2.c ex_docmd.c ex_eval.c ex_getln.c \
 	if_cscope.c if_xcmdsrv.c fileio.c findfile.c fold.c getchar.c \
@@ -320,7 +320,7 @@
 	$(GUI_SRC) $(PERL_SRC) $(PYTHON_SRC) $(TCL_SRC) \
  	$(RUBY_SRC) $(HANGULIN_SRC) $(MZSCH_SRC) $(XDIFF_SRC)
 
-OBJ = 	arabic.obj autocmd.obj beval.obj blob.obj blowfish.obj buffer.obj \
+OBJ = 	arabic.obj autocmd.obj beval.obj blob.obj blowfish.obj buffer.obj change.obj \
 	charset.obj crypt.obj crypt_zip.obj debugger.obj dict.obj diff.obj \
 	digraph.obj edit.obj eval.obj evalfunc.obj ex_cmds.obj ex_cmds2.obj \
 	ex_docmd.obj ex_eval.obj ex_getln.obj if_cscope.obj if_xcmdsrv.obj \
@@ -510,6 +510,10 @@
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
  globals.h version.h
+change.obj : change.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h term.h macros.h structs.h regexp.h \
+ gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
+ globals.h version.h
 charset.obj : charset.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \