update libyuv to r1456

picks up build warning fixes for visual studio 2015

Change-Id: Idea85fa70d1aeb2a46ea355b87fe41ec5b2b9520

examples.mk

diff --git a/examples.mk b/examples.mk
index fad02cf..8327ca0 100644
--- a/examples.mk
+++ b/examples.mk
@@ -22,17 +22,18 @@
                 third_party/libyuv/source/planar_functions.cc \
                 third_party/libyuv/source/row_any.cc \
                 third_party/libyuv/source/row_common.cc \
+                third_party/libyuv/source/row_gcc.cc \
                 third_party/libyuv/source/row_mips.cc \
                 third_party/libyuv/source/row_neon.cc \
                 third_party/libyuv/source/row_neon64.cc \
-                third_party/libyuv/source/row_posix.cc \
                 third_party/libyuv/source/row_win.cc \
                 third_party/libyuv/source/scale.cc \
+                third_party/libyuv/source/scale_any.cc \
                 third_party/libyuv/source/scale_common.cc \
+                third_party/libyuv/source/scale_gcc.cc \
                 third_party/libyuv/source/scale_mips.cc \
                 third_party/libyuv/source/scale_neon.cc \
                 third_party/libyuv/source/scale_neon64.cc \
-                third_party/libyuv/source/scale_posix.cc \
                 third_party/libyuv/source/scale_win.cc \
 
 LIBWEBM_MUXER_SRCS += third_party/libwebm/mkvmuxer.cpp \