Fix a build issue

Change-Id: I23a75c495ed7ea917d7f312bef0990e20a6b53d9

vp9/encoder/vp9_rdopt.c

diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index 05978d3..a70c904 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -299,7 +299,7 @@
                         plane_block_height_log2by4(bsize, pd));
 }
 
-static inline void linear_interpolate2(double x, int ntab, int inv_step,
+static INLINE void linear_interpolate2(double x, int ntab, int inv_step,
                                        const double *tab1, const double *tab2,
                                        double *v1, double *v2) {
   double y = x * inv_step;