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/Filelist b/Filelist
index 30d5d58..4832751 100644
--- a/Filelist
+++ b/Filelist
@@ -88,10 +88,11 @@
 		src/job.c \
 		src/json.c \
 		src/json_test.c \
+		src/keymap.h \
 		src/kword_test.c \
 		src/list.c \
 		src/locale.c \
-		src/keymap.h \
+		src/logfile.c \
 		src/macros.h \
 		src/main.c \
 		src/map.c \