Reduces RocksDB bindings size

rocksdb-sys/build.rs

@@ -24,6 +24,9 @@ fn bindgen_rocksdb() {
         .header("api/c.h")
         .ctypes_prefix("libc")
         .size_t_is_usize(true)
+        .allowlist_function("rocksdb_.*")
+        .allowlist_type("rocksdb_.*")
+        .allowlist_var("rocksdb_.*")
         .generate()
         .expect("unable to generate rocksdb bindings")
         .write_to_file(PathBuf::from(env::var("OUT_DIR").unwrap()).join("bindings.rs"))