Add missing include (facebook#13365)

Author: lnicola

Diff for: db/blob/blob_file_meta.h

@@ -6,6 +6,7 @@
 #pragma once
 
 #include <cassert>
+#include <cstdint>
 #include <iosfwd>
 #include <memory>
 #include <string>

Diff for: include/rocksdb/trace_record.h

@@ -5,6 +5,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>

Diff for: include/rocksdb/write_batch_base.h

@@ -9,6 +9,7 @@
 #pragma once
 
 #include <cstddef>
+#include <cstdint>
 
 #include "rocksdb/attribute_groups.h"
 #include "rocksdb/rocksdb_namespace.h"