message: Prioterize search path instead of overwriting it.
  Current LD_LIBRARY_PATH implementation overwrites the original search
  path, which is not the best idea, instead this patch would check
  LD_LIBRARY_PATH first and if it didn't find the libraries it is looking
  for, then it will search the original search path
diff: @@ -138,8 +138,8 @@ pub extern "C" fn relibc_ld_so_start(sp: &'static mut Stack, ld_entry: usize) ->
  // Some variables that will be overridden by environment and auxiliary vectors
  let library_path = match envs.get("LD_LIBRARY_PATH") {
  - Some(lib_path) => lib_path,
  - None => "/lib",
  + Some(lib_path) => lib_path.to_owned() + ":/lib",
  + None => "/lib".to_owned(),
  };
  let path = if is_manual {
  @@ -178,7 +178,7 @@ pub extern "C" fn relibc_ld_so_start(sp: &'static mut Stack, ld_entry: usize) ->
  }
  pr
  };
  - let mut linker = Linker::new(library_path, false);
  + let mut linker = Linker::new(&library_path, false);
  match linker.load(&path, &path) {
  Ok(()) => (),
  Err(err) => {
  