remove unecessary warnings from third_party code

platform_tools/android/gyp/dependencies.gypi

Index: platform_tools/android/gyp/dependencies.gypi
diff --git a/platform_tools/android/gyp/dependencies.gypi b/platform_tools/android/gyp/dependencies.gypi
index 86e9145d584bacd8725dd17d4b5de05335479847..82763bea115eb285515a853a723f786a2fa15715 100644
--- a/platform_tools/android/gyp/dependencies.gypi
+++ b/platform_tools/android/gyp/dependencies.gypi
@@ -25,6 +25,9 @@
         '../third_party/cpufeatures/cpu-features.c',
         '../third_party/cpufeatures/cpu-features.h',
       ],
+      'cflags': [
+        '-w',
+      ],
     },
     {
       'target_name': 'expat',
@@ -172,6 +175,7 @@
         '../third_party/externals/jpeg',
       ],
       'cflags': [
+        '-w',
         '-fvisibility=hidden',
         '-DAVOID_TABLES',
         '-O3',
@@ -179,9 +183,6 @@
         '-fprefetch-loop-arrays',
         '-DANDROID_TILE_BASED_DECODE',
       ],
-      'cflags!': [
-        '-Wall',
-      ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../third_party/externals/jpeg',