patch 7.4.1537
Problem:    Too many feature flags for pipes, jobs and channels.
Solution:   Only use FEAT_JOB_CHANNEL.
diff --git a/src/proto.h b/src/proto.h
index 7e4180b..d975f92 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -193,7 +193,7 @@
 # ifdef FEAT_NETBEANS_INTG
 #  include "netbeans.pro"
 # endif
-# ifdef FEAT_CHANNEL
+# ifdef FEAT_JOB_CHANNEL
 #  include "channel.pro"
 # endif