patch 8.2.1269: language and locale code spread out

Problem:    Language and locale code spread out.
Solution:   Move relevant code to src/locale.c. (Yegappan Lakshmanan,
            closes #6509)
diff --git a/src/Make_vms.mms b/src/Make_vms.mms
index 0d80c06..83b31f2 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -345,6 +345,7 @@
 	insexpand.c \
 	json.c \
 	list.c \
+	locale.c \
 	main.c \
 	map.c \
 	mark.c \
@@ -460,6 +461,7 @@
 	insexpand.obj \
 	json.obj \
 	list.obj \
+	locale.obj \
 	main.obj \
 	map.obj \
 	mark.obj \
@@ -865,6 +867,10 @@
  ascii.h keymap.h term.h macros.h option.h structs.h regexp.h gui.h \
  beval.h [.proto]gui_beval.pro alloc.h ex_cmds.h spell.h proto.h \
  globals.h
+locale.obj : locale.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h term.h macros.h option.h structs.h regexp.h gui.h \
+ beval.h [.proto]gui_beval.pro alloc.h ex_cmds.h spell.h proto.h \
+ globals.h
 main.obj : main.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 \