win clang: don't disable -Wself-assign

third_party/libpng/libpng.gyp

Index: third_party/libpng/libpng.gyp
diff --git a/third_party/libpng/libpng.gyp b/third_party/libpng/libpng.gyp
index ac8fdb41c929c38ac8d85fbf2adf7efdc753ffd9..cb1bdecde50427a130fe53cafa13fcdf89ee9810 100644
--- a/third_party/libpng/libpng.gyp
+++ b/third_party/libpng/libpng.gyp
@@ -69,6 +69,15 @@
             ],
           },          
         }],
+        ['OS=="win" and clang==1', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                '-Wno-self-assign',  # http://crbug.com/505306.

[Nico, 2015/06/29 23:51:02]

Likewise – add a

  'variables': {
    'clang_warning_flags': [ '-Wno-self-assign' ]
  }

block to the target instead

[scottmg, 2015/06/30 00:32:55]

Done.

+              ],
+            },
+          },
+        }],
         ['OS=="android"', {
           'toolsets': ['target', 'host'],
           'defines': [