rocksdb: do not build with --march=native

we can not assume that building host has the same arch (or the same cpu
capability) with the target machine.

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

diff --git a/src/rocksdb b/src/rocksdb
index 60a2bbba94a316c7a836425ffa68ae3e3f547b25..e55f42f2c0129d3037168aa62ab03b11d4360247 160000 (submodule)
--- a/src/rocksdb
+++ b/src/rocksdb
@@ -1 +1 @@
-Subproject commit 60a2bbba94a316c7a836425ffa68ae3e3f547b25
+Subproject commit e55f42f2c0129d3037168aa62ab03b11d4360247