libvpx: Pull from upstream

source/libvpx/build/make/iosbuild.sh

 #!/bin/sh
 ##
 ##  Copyright (c) 2014 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 93 matching lines @@
 
 #ifndef ${include_guard}
 #define ${include_guard}
 
 #if defined"
 
   printf "%s" "${file_header}" > "${config_file}"
   for target in ${targets}; do
     preproc_symbol=$(target_to_preproc_symbol "${target}")
     printf " ${preproc_symbol}\n" >> "${config_file}"
+    printf "#define VPX_FRAMEWORK_TARGET \"${target}\"\n" >> "${config_file}"
     printf "#include \"VPX/vpx/${target}/vpx_config.h\"\n" >> "${config_file}"
     printf "#elif defined" >> "${config_file}"
     mkdir "${HEADER_DIR}/${target}"
     cp -p "${BUILD_ROOT}/${target}/vpx_config.h" "${HEADER_DIR}/${target}"
   done
 
   # Consume the last line of output from the loop: We don't want it.
   sed -i '' -e '$d' "${config_file}"
 
   printf "#endif\n\n" >> "${config_file}"
@@ skipping 115 matching lines @@
   MAKE_JOBS=${MAKE_JOBS}
   PRESERVE_BUILD_OUTPUT=${PRESERVE_BUILD_OUTPUT}
   LIBVPX_SOURCE_DIR=${LIBVPX_SOURCE_DIR}
   LIPO=${LIPO}
   ORIG_PWD=${ORIG_PWD}
   TARGETS="${TARGETS}"
 EOF
 fi
 
 build_framework "${TARGETS}"