- Do not probe paths that do not exist (ENOENT).
- If the OS supports open()ing directories (HAVE_FDOPENDIR), do not
  probe paths that cannot be opened.
- Do not probe files whereby fstat() fails.
- Do not probe non-regular files other than directories and block
  devices (previously, only FIFOs were discarded).
- Look for anchor even if fstat() is not supported.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

See http://forum.videolan.org/viewtopic.php?f=14&t=90169

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

It makes sense, especially since the libav/FFmpeg split

Also, __USE_UNIX98 is a libc-internal definition. The build system is
not supposed to define that directly (we have _GNU_SOURCE).

(Note __BUILTIN__ was not used anymore as we have !__PLUGIN__)

I don't this abomination to leak through the stable LibVLC interface.
To link statically, modules should be linked into LibVLC instead.

And then, there is no need to reintroduce the old "builtin" vlc-config
type if all modules are built the same. In prehistoric times, the
distinction was needed because some modules were static and some not.

GCC takes the last -O* option, which defaults to -O0 anyway. With
./configure forcing -O0, there was no way to select a custom
optimization level via external CFLAGS.