Remove -Wno-unused-private-field clang warning suppression.

third_party/cld_2/cld_2.gyp

Index: third_party/cld_2/cld_2.gyp
diff --git a/third_party/cld_2/cld_2.gyp b/third_party/cld_2/cld_2.gyp
index 96bd9ff642f9b960a186fc0d4ac551f42b8530df..baef791d11aabfd56bc2a70f7de1f51c349ee65e 100644
--- a/third_party/cld_2/cld_2.gyp
+++ b/third_party/cld_2/cld_2.gyp
@@ -160,6 +160,12 @@
       'conditions': [
         ['OS=="win"', {
           'msvs_disabled_warnings': [4267], # size_t -> int conversion.
+          'variables': {
+            'clang_warning_flags': [

[Nico, 2015/07/09 01:58:16]

Are the fields windows-specific somehow? If not, move the variables section out
(so that it's next to 'sources' like in hunspell.gyp). If it's Windows-specific,
you don't really need to use clang_warning_flags but can use
msvs_settings/VCCLCompilerTool/AdditionalOptions (if clang==1) – the point of
clang_warning_flags is that it puts it into the right places on all platforms
(...VCCLCompilerTool... on win, xcode_settings... on mac, cflags elsewhere). I'm
guessing it's not Windows-specific and just happens to only fire on Windows
because third-party code builds with -Wall on Windows but not (yet?) elsewhere

[benwells, 2015/07/09 11:43:02]

Ah, not windows specific. Moved out from this.

+              # cld_2 contains unused private fields.
+              '-Wno-unused-private-field',
+            ],
+          },
         }],
         ['cld2_table_size==0', {
           'sources+': ['<@(cld2_data_smallest_sources)']