Instruct yasm to compile position independent code on Android

gyp/libjpeg-turbo.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/externals/libjpeg-turbo',
@@ skipping 241 matching lines @@
             'yasm.gyp:yasm#host',
           ],
           'variables': {
             'yasm_path': '<(PRODUCT_DIR)/yasm',
             'conditions': [
               [ 'skia_arch_type == "x86"', {
                 'yasm_format': '-felf',
                 'yasm_flags': [
                   '-D__x86__',
                   '-DELF',
+                  '-DPIC',
                 ],
               }, {
                 'yasm_format': '-felf64',
                 'yasm_flags': [
                   '-D__x86_64__',
                   '-DELF',
+                  '-DPIC',
                 ],
               }],
             ],
           },
         }],
         [ '(skia_os == "mac" or skia_os == "ios") and \
            (skia_arch_type == "x86" or skia_arch_type == "x86_64")', {
           'dependencies': [
             'yasm.gyp:yasm#host',
           ],
@@ skipping 64 matching lines @@
               ],
               'process_outputs_as_sources': 1,
               'message': 'Building <(RULE_INPUT_ROOT).<(object_suffix)',
             }],
           ]
         },
       ],
     },
   ],
 }