fix: 'bz_internal_error': symbol multiply defined! (tikv#628)

Author: nanpuyue

librocksdb-sys/src/lib.rs

@@ -26,9 +26,3 @@ extern crate libz_sys;
 extern crate zstd_sys;
 
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
-
-#[cfg(feature = "bzip2")]
-#[no_mangle]
-pub fn bz_internal_error(errcode: libc::c_int) {
-    panic!("bz internal error: {}", errcode);
-}