libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_filter.h

Index: source/libvpx/vp9/common/vp9_filter.h
diff --git a/source/libvpx/vp9/common/vp9_filter.h b/source/libvpx/vp9/common/vp9_filter.h
index d963ee2356918f745ed726e5363c9dfa23d9093e..808a270facbfeea6df3545a43247361c917092bf 100644
--- a/source/libvpx/vp9/common/vp9_filter.h
+++ b/source/libvpx/vp9/common/vp9_filter.h
@@ -43,14 +43,6 @@ typedef int16_t InterpKernel[SUBPEL_TAPS];
 
 const InterpKernel *vp9_get_interp_kernel(INTERP_FILTER filter);
 
-DECLARE_ALIGNED(256, extern const InterpKernel,
-                vp9_bilinear_filters[SUBPEL_SHIFTS]);
-
-// The VP9_BILINEAR_FILTERS_2TAP macro returns a pointer to the bilinear
-// filter kernel as a 2 tap filter.
-#define BILINEAR_FILTERS_2TAP(x) \
-  (vp9_bilinear_filters[(x)] + SUBPEL_TAPS/2 - 1)
-
 #ifdef __cplusplus
 }  // extern "C"
 #endif