quiet down more third-party warnings in poppler and jsoncpp

BUG=
R=djsollen@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/25319002

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@11530 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/jsoncpp.gyp b/jsoncpp.gyp
index ab00db9..390f8f9 100644
--- a/jsoncpp.gyp
+++ b/jsoncpp.gyp
@@ -49,12 +49,8 @@
           '../third_party/externals/jsoncpp/include/',
         ],
       },
-      'conditions': [
-        [ 'skia_os == "android"', {
-          'cflags!': [
-            '-Wall',
-          ],
-        }],
+      'cflags': [
+        '-w',
       ],
     },
   ],
diff --git a/poppler.gyp b/poppler.gyp
index f99e32c..5b53389 100644
--- a/poppler.gyp
+++ b/poppler.gyp
@@ -126,6 +126,9 @@
           '../third_party/externals/poppler/poppler',
         ],
       },
+      'cflags': [
+        '-w'
+      ],
       'conditions': [
         ['skia_os == "linux"', {
           'include_dirs': [