Sync w/ glibc, we can leave __USE_ATFILE in, because we do not define it in features.h
Sync w/ glibc, we can leave __USE_ATFILE in, because we do not define it in features.h

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc