Deletion of Dirent.h

Comment: like all C POSIX headers articles we have. Yes, I know that  is not the best reason, but I'd like to strive for consistency: either we reason on them all (e.g. merging all of them in a single article), or we keep them all separated, or anyway we arrive at a criteria. If it reads like a manual, this can be solved by editing, not deletion. Oh, and of course it is notable -books cover it, e.g. http://books.google.it/books?id=DYUhAQAAIAAJ&q=dirent.h&dq=dirent.h&hl=it&sa=X&ei=2s6WUNnJEoeC4gSm8IHwBA&redir_esc=y here
Stance: keep
Cited policy: Wikipedia:Arguments to avoid in deletion discussions (WP:OTHERSTUFFEXISTS)