Fix RocksDB Lite build failure in c_test.cc

Summary:
Fix the following RocksDB Lite build failure in c_test.cc

db/c_test.c:1051:3: error: implicit declaration of function 'fprintf' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  fprintf(stderr, "SKIPPED\n");
  ^
db/c_test.c:1051:3: error: declaration of built-in function 'fprintf' requires inclusion of the header <stdio.h> [-Werror,-Wbuiltin-requires-header]
db/c_test.c:1051:11: error: use of undeclared identifier 'stderr'
  fprintf(stderr, "SKIPPED\n");
          ^
3 errors generated.
Closes https://github.com/facebook/rocksdb/pull/1479

Differential Revision: D4151160

Pulled By: yhchiang

fbshipit-source-id: a471a30

db/c_test.c

@@ -2,12 +2,13 @@
    Use of this source code is governed by a BSD-style license that can be
    found in the LICENSE file. See the AUTHORS file for names of contributors. */
 
+#include <stdio.h>
+
 #ifndef ROCKSDB_LITE  // Lite does not support C API
 
 #include "rocksdb/c.h"
 
 #include <stddef.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>