Fix for benchmarks compiling with imports

Author: tristanphease

src/vp8.rs

@@ -1386,7 +1386,7 @@ fn set_chroma_border(
     }
 }
 
-fn predict_4x4(ws: &mut [u8], stride: usize, modes: &[IntraMode], resdata: &[i32]) {
+pub(crate) fn predict_4x4(ws: &mut [u8], stride: usize, modes: &[IntraMode], resdata: &[i32]) {
     for sby in 0usize..4 {
         for sbx in 0usize..4 {
             let i = sbx + sby * 4;

src/vp8_prediction.rs

@@ -473,6 +473,8 @@ pub(crate) fn predict_bhupred(a: &mut [u8], x0: usize, y0: usize, stride: usize)
 #[cfg(all(test, feature = "_benchmarks"))]
 mod benches {
     use super::*;
+    use crate::vp8::predict_4x4;
+    use crate::vp8_common::*;
     use test::{black_box, Bencher};
 
     const W: usize = 256;