libs3: update to latest git master of ceph/libs3

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

diff --git a/src/libs3 b/src/libs3
index 9dc3a9c683385abfe4ad92b7c6ff30719acc3c13..dcf98ff04bc5dacd5d45854a32870d86dd7b26c7 160000 (submodule)
--- a/src/libs3
+++ b/src/libs3
@@ -1 +1 @@
-Subproject commit 9dc3a9c683385abfe4ad92b7c6ff30719acc3c13
+Subproject commit dcf98ff04bc5dacd5d45854a32870d86dd7b26c7