patch 9.0.0977: it is not easy to see what client-server commands are doing

Problem:    It is not easy to see what client-server commands are doing.
Solution:   Add channel log messages if ch_log() is available.  Move the
            channel logging and make it available with the +eval feature.
diff --git a/src/Make_vms.mms b/src/Make_vms.mms
index 20cf52f..53e1ce1 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -357,6 +357,7 @@
 	json.c \
 	list.c \
 	locale.c \
+	logfile.c \
 	main.c \
 	map.c \
 	mark.c \
@@ -481,6 +482,7 @@
 	json.obj \
 	list.obj \
 	locale.obj \
+	logfile.obj \
 	main.obj \
 	map.obj \
 	mark.obj \
@@ -928,6 +930,10 @@
  ascii.h keymap.h termdefs.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 \
  errors.h globals.h
+logfile.obj : logfile.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h termdefs.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 \
+ errors.h globals.h
 main.obj : main.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h termdefs.h macros.h structs.h regexp.h gui.h beval.h \
  [.proto]gui_beval.pro option.h ex_cmds.h proto.h errors.h globals.h \