iOS: add PlistBuddy location to path to avoid build errors

webrtc/build/ios/build_ios_libs.sh

 #!/bin/bash
 
 #  Copyright 2015 The WebRTC 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.
 
 # Generates static or dynamic FAT libraries for ios in out_ios_libs.
 
 # Exit on errors.
 set -e
 
+# Environment
+export PATH=/usr/libexec:$PATH
+
 # Globals.
 SCRIPT_DIR=$(cd $(dirname $0) && pwd)
 WEBRTC_BASE_DIR=${SCRIPT_DIR}/../../..
 GYP_WEBRTC_SCRIPT=${WEBRTC_BASE_DIR}/webrtc/build/gyp_webrtc.py
 MERGE_SCRIPT=${SCRIPT_DIR}/merge_ios_libs.py
 LICENSE_SCRIPT=${SCRIPT_DIR}/generate_licenses.py
 
 function check_preconditions {
   # Check for Darwin.
   if [[ ! $(uname) = "Darwin" ]]; then
@@ skipping 239 matching lines @@
   else
     mkdir -p ${OUTPUT_HEADER_DIR}
     ln -sf ${INPUT_HEADER_DIR} ${OUTPUT_HEADER_DIR}/WebRTC
   fi
 fi
 
 echo "Generating LICENSE.html."
 ${LICENSE_SCRIPT} ${OUTPUT_DIR}/arm64_libs ${OUTPUT_DIR}
 
 echo "Done!"