This fixes compilation on WinCE, where signal.h is missing

This will render the plugins cache locale-independent.

Remove useless patch and update arch parameters

Thanks to ivoire for noticing it.

Signed-off-by: Ilkka Ollakka <ileoo@iki.fi>

Signed-off-by: Ilkka Ollakka <ileoo@iki.fi>

Should work in linux, no idea on win32 builds, so you're free to reverts
if it kills your kittens.

This means that multithread encoding with avcodec now needs
--enable-pthreads/--enable-w32threads.

There is a window of opportunity to leak file descriptors between
their creation and the fcntl(FD_CLOEXEC) call. If another thread forks
during this window, the descriptors will not have a the close-on-exec
flag, and get leaked after exec(). This is a limitation of POSIX.

While we're using the Linux-specific SOCK_CLOEXEC, we might as well
use SOCK_NONBLOCK, and spare ourselves the three fcntl() calls.

s/input_info/input.info/

 * deleting non-existent callback is not allowed (-> abort),
 * adding a callback but not deleting it is a bad idea,
 * deleting a callback while setting the valeu can race against other
   interfaces.

--v4l-vdev is obsolete.