libutils: Import strrchr from newlib

libfdt 1.4.7 depends on strrchr, this patch imports the same from newlib.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Etienne Carr

libutils: Import strrchr from newlib

libfdt 1.4.7 depends on strrchr, this patch imports the same from newlib.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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