libvpx: Pull from upstream

libvpx: Pull from upstream

Current HEAD: 6201a256f48c7fccbe2c1f7778ad75b0693ac6d9

git log from upstream:
43a3455 configure: append --extra-cflags to final set
820302a vp8: use VPX(MIN|MAX) from vpx_dsp_common.h
f5507b5 Only build ssse3 filter functions on 64 bit
06ba525 Clean up unused function warnings in vp8 encoder
821f029 Clean up unused function warnings in vp8 onyx_if.c
5c055cc Clean up unused function warnings in vp8 common
a28b2c6 Add sse2 versions of halfpix variance
5e16d39 vpx_dsp_common: add VPX prefix to MIN/MAX
c052309 vp8e_encode: check validate_config return
a390b90 vp9_update_layer_...config: delete dead assignment
1b556e1 vp9_spatial_svc_encoder: Enable aq-mode for real-time mode.
28bd767 Remove vp10_default_scan_orders[] that is unused
1c07691 vp10 cleanup: remove nonrd and real-time code
4ebded6 vp9_spatial_svc_encoder: Add encoding time log.
6909718 Clean up unused function warnings in vp8 decoder
51b654e Remove vp8_priv_sz
467c66e Mark Scale2Ratio INLINE
a1ec3eb Limit new motion vector size
aa006d7 Add transform size rate for intra skip mode in rdopt
653832e Prevent an ASAN failure for svc tests
<...>

TBR=tomfinegan@chromium.org

Committed: https://chromium.googlesource.com/chromium/deps/libvpx/+/da9af1d85ddbfffd3da7ffafa08448202705e113

[Johann, 2015-08-31 18:09:04]

Committed patchset #1 (id:1) manually as
da9af1d85ddbfffd3da7ffafa08448202705e113 (presubmit successful).

[Tom Finegan, 2015-08-31 18:34:42]

On 2015/08/31 18:09:04, Johann wrote:
> Committed patchset #1 (id:1) manually as
> da9af1d85ddbfffd3da7ffafa08448202705e113 (presubmit successful).

lgtm