Fix warnings-as-errors in Android third-party libs

gyp/dependencies.gypi

Index: gyp/dependencies.gypi
===================================================================
--- gyp/dependencies.gypi	(revision 8325)
+++ gyp/dependencies.gypi	(working copy)
@@ -9,6 +9,9 @@
 # tested. 
 
 {
+  'variables': {
+    'skia_warnings_as_errors': 0,
+  },
   'targets': [
     {
       'target_name': 'cpu_features',
@@ -22,6 +25,9 @@
         '../third_party/cpufeatures/cpu-features.c',
         '../third_party/cpufeatures/cpu-features.h',
       ],
+      'cflags!': [
+        '-fno-rtti', # supresses warnings about invalid option of non-C++ code
+      ],
     },
     {
       'target_name': 'expat',
@@ -69,7 +75,6 @@
       'cflags!': [
         '-fno-rtti', # supresses warnings about invalid option of non-C++ code
         '-Wall',
-        '-Werror',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
@@ -108,7 +113,6 @@
       'cflags!': [
         '-fno-rtti', # supresses warnings about invalid option of non-C++ code
         '-Wall',
-        '-Werror',
       ],
       'link_settings': {
         'libraries': [
@@ -186,7 +190,6 @@
       'cflags!': [
         '-fno-rtti', # supresses warnings about invalid option of non-C++ code
         '-Wall',
-        '-Werror',
       ],
       'direct_dependent_settings': {
         'include_dirs': [