rocksdb: pickup change to link against libsnappy.a

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/rocksdb b/src/rocksdb
index 9090ae3ecfbf9b50a398a5d8b178f14b88dc047e..8e78d1040a6e2bae1577c484feefb2b92038ab9d 160000 (submodule)
--- a/src/rocksdb
+++ b/src/rocksdb
@@ -1 +1 @@
-Subproject commit 9090ae3ecfbf9b50a398a5d8b178f14b88dc047e
+Subproject commit 8e78d1040a6e2bae1577c484feefb2b92038ab9d