Fix link error in real-time mode

make vp8_mv_pred() and vp8_cal_sad() available in real-time mode.

Change-Id: I71dbae241b486ba943458dcbae552ec4a51689d3

vp8/encoder/rdopt.c

diff --git a/vp8/encoder/rdopt.c b/vp8/encoder/rdopt.c
index 1ece1bf..ea21cf4 100644
--- a/vp8/encoder/rdopt.c
+++ b/vp8/encoder/rdopt.c
@@ -1419,6 +1419,7 @@
 
     return bsi.segment_rd;
 }
+#endif
 
 static void swap(int *x,int *y)
 {
@@ -1706,6 +1707,7 @@
     }
 }
 
+#if !(CONFIG_REALTIME_ONLY)
 int vp8_rd_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset, int recon_uvoffset, int *returnrate, int *returndistortion, int *returnintra)
 {
     BLOCK *b = &x->block[0];