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/time.c b/src/time.c
index a7daaf1..891a9f4 100644
--- a/src/time.c
+++ b/src/time.c
@@ -491,7 +491,7 @@
     typval_T	rettv;
     typval_T	argv[2];
 
-#ifdef FEAT_JOB_CHANNEL
+#ifdef FEAT_EVAL
     if (ch_log_active())
     {
 	callback_T *cb = &timer->tr_callback;
@@ -509,7 +509,7 @@
     call_callback(&timer->tr_callback, -1, &rettv, 1, argv);
     clear_tv(&rettv);
 
-#ifdef FEAT_JOB_CHANNEL
+#ifdef FEAT_EVAL
     ch_log(NULL, "timer callback finished");
 #endif
 }