rocksdb: remove copy ctor

Signed-off-by: Cholerae Hu <huyingqian@pingcap.com>

librocksdb_sys/crocksdb/c.cc

@@ -112,10 +112,7 @@ struct crocksdb_readoptions_t {
    Slice upper_bound; // stack variable to set pointer to in ReadOptions
 };
 struct crocksdb_writeoptions_t    { WriteOptions      rep; };
-struct crocksdb_options_t         { 
-  crocksdb_options_t() = default;
-  crocksdb_options_t(const crocksdb_options_t& other): rep(other.rep) {}
-  Options           rep; };
+struct crocksdb_options_t         { Options           rep; };
 struct crocksdb_compactoptions_t {
   CompactRangeOptions rep;
 };
@@ -1594,7 +1591,7 @@ crocksdb_options_t* crocksdb_options_create() {
 }
 
 crocksdb_options_t* crocksdb_options_copy(const crocksdb_options_t *other) {
-  return new crocksdb_options_t(*other);
+  return new crocksdb_options_t { Options(other->rep) };
 }
 
 void crocksdb_options_destroy(crocksdb_options_t* options) {