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In libaom CMake configuration:
-Wenum-conversion and -Wparentheses-equality are enabled by default
in clang and not explicitly disabled.
-Wunused-function is from CMake defaults and no longer disabled.
-Wsign-compare is explicitly enabled.

The symbol "_vpx_scaled_2d" is no longer present, so the bug that
required "-fno-common" should be resolved.

Bug: 783519
Change-Id: I099b89c3b418fb2cd50bc19af167deaf71f12a6c
Reviewed-on: https://chromium-review.googlesource.com/1100370Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#567268}