Fix all relative includes to third_party.

build/standalone.gypi

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Definitions to be used when building stand-alone PDFium binaries.
 
 {
   'variables': {
     'component%': 'static_library',
     'clang%': 0,
@@ skipping 31 matching lines @@
       'target_arch%': '<(target_arch)',
     },
     'clang_dir%': 'third_party/llvm-build/Release+Asserts',
     # These two are needed by V8.
     'host_arch%': '<(host_arch)',
     'target_arch%': '<(target_arch)',
     'werror%': '-Werror',
     'v8_optimized_debug%': 0,
     'v8_use_external_startup_data%': 0,
     'icu_gyp_path': '../v8/third_party/icu/icu.gyp',
+    'libjpeg_gyp_path': '../third_party/third_party.gyp',
     'conditions': [
       ['OS == "win"', {
         'os_posix%': 0,
       }, {
         'os_posix%': 1,
       }],
       ['OS=="linux" or OS=="mac"', {
         'clang%': 1,
       }, {
         'clang%': 0,
@@ skipping 272 matching lines @@
       ],
     }],  # OS=="linux" or OS=="mac"
     ["use_goma==1", {
       'make_global_settings': [
         ['CC_wrapper', '<(gomadir)/gomacc'],
         ['CXX_wrapper', '<(gomadir)/gomacc'],
       ],
     }],  # use_goma==1
   ],
 }