Use readdir_r() instead of readdir().

especially, also detect material recorded at the stream filter level

same options needed for vlc_accept as those for vlc_socket

(cherry picked from commit 7ba508f8)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This Linux-specific extension fixes the close-on-exec race.

This departs from utf8_open() being a pure open() + Unicode function.
We should really always set the flag anyway, so lets factor the code.
There is still a tiny race between open() and the second fcntl() system
call, but it cannot quite be fixed within the current POSIX standards.

By the way, the correct way to clear the flag would be _after_ fork(),
but I am not aware of any such case involving utf8_open() in the
current tree.

Fix includes for WinCE
Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>

This improves readability a lot and prevent us from reinventing the wheel.