rocksdb: fix i386 build

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/rocksdb b/src/rocksdb
index ab4d781db2f1ec6a47bd1ec6fe680fa9a8091e09..05da5930f3a130c4dea879a85a26f2c8ac7465c4 160000 (submodule)
--- a/src/rocksdb
+++ b/src/rocksdb
@@ -1 +1 @@
-Subproject commit ab4d781db2f1ec6a47bd1ec6fe680fa9a8091e09
+Subproject commit 05da5930f3a130c4dea879a85a26f2c8ac7465c4