Fixed the compile error in RocksDBLite in memory_test.cc

Summary:
Fixed the following compile error in RocksDBLite:

18:00:33   CC       utilities/memory/memory_test.o
18:00:33 utilities/memory/memory_test.cc: In function ‘int main(int, char**)’:
18:00:33 utilities/memory/memory_test.cc:268:66: error: ‘printf’ was not declared in this scope
18:00:33    printf("Skipped in RocksDBLite as utilities are not supported.");
18:00:33                                                                   ^

Test Plan: make OPT=-DROCKSDB_LITE memory_test

Reviewers: igor, sdong, anthony, IslamAbdelRahman

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D50145

utilities/memory/memory_test.cc

@@ -263,9 +263,12 @@ int main(int argc, char** argv) {
   return 0;
 #endif
 }
+
 #else
+#include <cstdio>
+
 int main(int argc, char** argv) {
-  printf("Skipped in RocksDBLite as utilities are not supported.");
+  printf("Skipped in RocksDBLite as utilities are not supported.\n");
   return 0;
 }
 #endif  // !ROCKSDB_LITE