The top level Makefile disables this warning. When building an
i386_defconfig with Clang, this warning is triggered a whole bunch via
includes of headers from perf.

Link: https://github.com/ClangBuiltLinux/continuous-integration/pull/182Signed-off-by: NNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: NNathan Chancellor <natechancellor@gmail.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200426214215.139435-1-ndesaulniers@google.com