Use elf.h inside the package.
Use elf.h inside the package.

MAC does not have elf.h, so use the elf.h inside the package instead
of the one in the system.
One failure example is
https://codereview.chromium.org/1978803003/

TEST=make; make check
BUG=
R=michaelbai@chromium.org

Review URL: https://codereview.chromium.org/1984713002 .

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