libvpx: Pull from upstream

source/libvpx/libs.mk

 ##
 ##  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 ##
 ##  Use of this source code is governed by a BSD-style license
 ##  that can be found in the LICENSE file in the root of the source
 ##  tree. An additional intellectual property rights grant can be found
 ##  in the file PATENTS.  All contributing project authors may
 ##  be found in the AUTHORS file in the root of the source tree.
 ##
 
@@ skipping 115 matching lines @@
   include $(SRC_PATH_BARE)/$(VP9_PREFIX)vp9dx.mk
   CODEC_SRCS-yes += $(addprefix $(VP9_PREFIX),$(call enabled,VP9_DX_SRCS))
   CODEC_EXPORTS-yes += $(addprefix $(VP9_PREFIX),$(VP9_DX_EXPORTS))
   CODEC_SRCS-yes += $(VP9_PREFIX)vp9dx.mk vpx/vp8.h vpx/vp8dx.h
   INSTALL-LIBS-yes += include/vpx/vp8.h include/vpx/vp8dx.h
   INSTALL_MAPS += include/vpx/% $(SRC_PATH_BARE)/$(VP9_PREFIX)/%
   CODEC_DOC_SRCS += vpx/vp8.h vpx/vp8dx.h
   CODEC_DOC_SECTIONS += vp9 vp9_decoder
 endif
 
+VP9_PREFIX=vp9/
+$(BUILD_PFX)$(VP9_PREFIX)%.c.o: CFLAGS += -Wextra
 
 ifeq ($(CONFIG_ENCODERS),yes)
   CODEC_DOC_SECTIONS += encoder
 endif
 ifeq ($(CONFIG_DECODERS),yes)
   CODEC_DOC_SECTIONS += decoder
 endif
 
 
 ifeq ($(CONFIG_MSVS),yes)
@@ skipping 433 matching lines @@
 EXAMPLES_BIN_PATH := $(TGT_OS:win64=x64)/Release
 endif
 exampletest: examples testdata
         $(qexec)$(SRC_PATH_BARE)/test/examples.sh \
                 --test-data-path $(LIBVPX_TEST_DATA_PATH) \
                 --bin-path $(EXAMPLES_BIN_PATH)
 else
 exampletest:
         @echo Unit tests must be enabled to make the exampletest target.
 endif