fix compile for optimistic_transaction_test under ROCKSDB_LITE

Summary: Adding a main for optimistic_transaction_test that report that it was skipped when using ROCKSDB_LITE

Test Plan: optimistic_transaction_test

Reviewers: yhchiang, sdong, igor, anthony

Reviewed By: anthony

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D41979

utilities/transactions/optimistic_transaction_test.cc

@@ -843,4 +843,14 @@ int main(int argc, char** argv) {
   return RUN_ALL_TESTS();
 }
 
-#endif  // ROCKSDB_LITE
+#else
+#include <stdio.h>
+
+int main(int argc, char** argv) {
+  fprintf(
+      stderr,
+      "SKIPPED as optimistic_transaction is not supported in ROCKSDB_LITE\n");
+  return 0;
+}
+
+#endif  // !ROCKSDB_LITE