REORG: include: move ssl_utils.h to haproxy/ssl_utils.h

Just added buf-t and openssl-compat for the missing types that appear
in the prototypes.
diff --git a/src/ssl_ckch.c b/src/ssl_ckch.c
index 61dd353..1fc0d18 100644
--- a/src/ssl_ckch.c
+++ b/src/ssl_ckch.c
@@ -23,6 +23,7 @@
 
 #include <haproxy/base64.h>
 #include <haproxy/errors.h>
+#include <haproxy/ssl_utils.h>
 #include <haproxy/tools.h>
 
 #include <import/ebsttree.h>
@@ -35,7 +36,6 @@
 #include <proto/channel.h>
 #include <proto/ssl_ckch.h>
 #include <proto/ssl_sock.h>
-#include <proto/ssl_utils.h>
 #include <proto/stream_interface.h>
 
 /* Uncommitted CKCH transaction */