libutils: import bcmp() from newlib

Recent versions of Clang (later than 8.0.0) may replace calls to
memcmp() by bcmp(). Therefore, provide an implementation of this
function to avoid unresolved sym

libutils: import bcmp() from newlib

Recent versions of Clang (later than 8.0.0) may replace calls to
memcmp() by bcmp(). Therefore, provide an implementation of this
function to avoid unresolved symbol errors.
The same issue was fixed in a similar way in the Linux kernel [1].

Link: [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f074f3e192f10c9fade898b9b3b8812e3d83342
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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