libutils: Import part of sys/fcntl.h

Import part of sys/fcntl.h for necessary file flags, from newlib:
- newlib/newlib/libc/include/sys/fcntl.h

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Ac

libutils: Import part of sys/fcntl.h

Import part of sys/fcntl.h for necessary file flags, from newlib:
- newlib/newlib/libc/include/sys/fcntl.h

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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