Merge branch 'jc/git-open-cloexec'

The codeflow of setting NOATIME and CLOEXEC on file descriptors Git opens has been simplified. We may want to drop the tip one, but we'll see. * jc/git-open-cloexec: sha1_file: stop opening files with O_NOATIME git_open_cloexec(): use fcntl(2) w/ FD_CLOEXEC fallback git_open(): untangle possible NOATIME and CLOEXEC interactions