Don't include C++ headers in extern C

include/leveldb/c.h

@@ -40,16 +40,16 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_C_H_
 #define STORAGE_LEVELDB_INCLUDE_C_H_
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "leveldb/export.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Exported types */
 
 typedef struct leveldb_t leveldb_t;