Suppress warnings for assignment inside conditionals.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 24fe92716c7dec50e0431a769956848c20e12c5d..1529719aba1f7b550a5c0e3521fe349ea81a4ad4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -77,6 +77,7 @@ config("icu_code") {
         # See http://bugs.icu-project.org/trac/ticket/11122
         "-Wno-inline-new-delete",
         "-Wno-implicit-exception-spec-mismatch",
+        "-Wno-parentheses",

[Nico, 2015/06/30 04:45:56]

I'd probably put this in the general is_clang block above, there isn't much
Windows-specific about this. (It's currently only needed on Windows because we
happen to build third-party code with -Wall on Windows but not elsewhere, but
that's mostly by accident.)

       ]
     }
   }