Allowed zero-cost enforced ordering of features in startup banner

list.

Added FEATURE() macros to most relevant (non-driver) files.

src/net/tcp/ftp.c

@@ -11,6 +11,7 @@
 #include <gpxe/xfer.h>
 #include <gpxe/open.h>
 #include <gpxe/uri.h>
+#include <gpxe/features.h>
 #include <gpxe/ftp.h>
 
 /** @file
@@ -19,6 +20,8 @@
  *
  */
 
+FEATURE ( FEATURE_PROTOCOL, "FTP", DHCP_EB_FEATURE_FTP, 1 );
+
 /**
  * FTP states
  *