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/ui.c b/src/ui.c
index 9fc88e5..7658c52 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -538,8 +538,6 @@
 #ifdef FEAT_EVAL
     if (ui_delay_for_testing > 0)
 	msec = ui_delay_for_testing;
-#endif
-#ifdef FEAT_JOB_CHANNEL
     ch_log(NULL, "ui_delay(%ld)", msec);
 #endif
 #ifdef FEAT_GUI
@@ -968,7 +966,7 @@
 #  else
 	len = read(read_cmd_fd, (char *)inbuf + inbufcount, readlen);
 #  endif
-#  ifdef FEAT_JOB_CHANNEL
+#  ifdef FEAT_EVAL
 	if (len > 0)
 	{
 	    inbuf[inbufcount + len] = NUL;