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This is really silly, but gyp doesn't seem to track if a static_library
contains C++ code and needs a C++ link step. So our copy of libxml
breaks us by containing a little bit of (chromium-added) C++ code. This
is really a correctness issue in the build system.

BUG=445627
TEST=linux_ecs_ozone tryjob

Review URL: https://codereview.chromium.org/872493004

Cr-Commit-Position: refs/heads/master@{#315138}