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GCC's analogous command-line argument is -Wno-unused-local-typedefs, with an
's' at the end, and //build/config/compiler/BUILD.gn already passes it to
the compiler unconditionally when clang is not being used.

This CL prevents warnings in the GCC build that look like this:

    cc1plus: warning: unrecognized command line option ‘-Wno-unused-local-typedef’

Change-Id: Icec95a6d1cf3a4bcd4f3a0acb7f002850aa9f7af
Reviewed-on: https://chromium-review.googlesource.com/980942Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#546113}