[CLEANUP] buffer->cto is not used anymore

The connection timeout stored in the buffer has not been used since the
stream interface were introduced. Let's get rid of it as it's one of the
things that complicate factoring of the accept() functions.
diff --git a/include/types/buffers.h b/include/types/buffers.h
index 59e6d29..6ed8ca6 100644
--- a/include/types/buffers.h
+++ b/include/types/buffers.h
@@ -2,7 +2,7 @@
  * include/types/buffers.h
  * Buffer management definitions, macros and inline functions.
  *
- * Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
+ * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -175,7 +175,6 @@
 	int wex;                        /* expiration date for a write or connect, in ticks */
 	int rto;                        /* read timeout, in ticks */
 	int wto;                        /* write timeout, in ticks */
-	int cto;                        /* connect timeout, in ticks */
 	unsigned int l;                 /* data length */
 	char *r, *w, *lr;               /* read ptr, write ptr, last read */
 	unsigned int size;              /* buffer size in bytes */