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/message.c b/src/message.c
index 3ba1a59..a2fc008 100644
--- a/src/message.c
+++ b/src/message.c
@@ -161,7 +161,7 @@
 		&& STRCMP(s, last_msg_hist->msg)))
 	add_msg_hist((char_u *)s, -1, attr);
 
-#ifdef FEAT_JOB_CHANNEL
+#ifdef FEAT_EVAL
     if (emsg_to_channel_log)
 	// Write message in the channel log.
 	ch_log(NULL, "ERROR: %s", s);
@@ -725,7 +725,7 @@
 	    if (emsg_silent == emsg_silent_def)
 		++did_emsg_def;
 #endif
-#ifdef FEAT_JOB_CHANNEL
+#ifdef FEAT_EVAL
 	    ch_log(NULL, "ERROR silent: %s", (char *)s);
 #endif
 	    return TRUE;