pickrst.c: make acc_stat_one_line static

Bug: aomedia:3416
Change-Id: I49517044fe7c2745af00f347e43a552f697e68d2
diff --git a/av1/encoder/pickrst.c b/av1/encoder/pickrst.c
index c095f69..9889c46 100644
--- a/av1/encoder/pickrst.c
+++ b/av1/encoder/pickrst.c
@@ -938,10 +938,11 @@
   if (cost_sgr < cost_none) rsc->sgrproj = rusi->sgrproj;
 }
 
-void acc_stat_one_line(const uint8_t *dgd, const uint8_t *src, int dgd_stride,
-                       int h_start, int h_end, uint8_t avg,
-                       const int wiener_halfwin, const int wiener_win2,
-                       int32_t *M_int32, int32_t *H_int32, int count) {
+static void acc_stat_one_line(const uint8_t *dgd, const uint8_t *src,
+                              int dgd_stride, int h_start, int h_end,
+                              uint8_t avg, const int wiener_halfwin,
+                              const int wiener_win2, int32_t *M_int32,
+                              int32_t *H_int32, int count) {
   int j, k, l;
   int16_t Y[WIENER_WIN2];