__USE_XOPEN2K8 in kopensolaris-gnu-bits/fcntl.h

Put O_CLOEXEC (new), O_NOFOLLOW, O_DIRECTORY under __USE_XOPEN2K8

For O_CLOEXEC on illumos see
https://github.com/illumos/illumos-gate/commit/b075ad5b007248d50e4c2e838b460c9c7cfd9fad