CLEANUP: cfgparse: remove duplicate registration for transparent build options

Since commit 37bafdcbb ("MINOR: sock_inet: move the IPv4/v6 transparent mode code
to sock_inet"), build options for transparent proxying are registered twice.
This patch removes the older one.
diff --git a/src/cfgparse-tcp.c b/src/cfgparse-tcp.c
index 0bf347b..4dc39d5 100644
--- a/src/cfgparse-tcp.c
+++ b/src/cfgparse-tcp.c
@@ -289,29 +289,6 @@
 
 INITCALL1(STG_REGISTER, srv_register_keywords, &srv_kws);
 
-
-REGISTER_BUILD_OPTS("Built with transparent proxy support using:"
-#if defined(IP_TRANSPARENT)
-		    " IP_TRANSPARENT"
-#endif
-#if defined(IPV6_TRANSPARENT)
-		    " IPV6_TRANSPARENT"
-#endif
-#if defined(IP_FREEBIND)
-		    " IP_FREEBIND"
-#endif
-#if defined(IP_BINDANY)
-		    " IP_BINDANY"
-#endif
-#if defined(IPV6_BINDANY)
-		    " IPV6_BINDANY"
-#endif
-#if defined(SO_BINDANY)
-		    " SO_BINDANY"
-#endif
-		    "");
-
-
 /*
  * Local variables:
  *  c-indent-level: 8