Use segment duration mtime_t

Conflicts:
	include/vlc_stream.h
	modules/codec/x264.c

The definition for vlc_rewinddir has been moved to include/vlc_fs.h. It
conflicted with the definition in src/libvlc.h.

vlc_scandir() uses vlc_loaddir() whichs calls rewinddir. Under Windows this
results in a segmentation fault.

Start playback right after successfull downloading of the first segment. Switch to a higher bandwidth
later on. By the time peeking and first segment have been played the next segment is available.
(cherry picked from commit 82512718)

Conflicts:

	modules/stream_filter/httplive.c

Conflicts:
	modules/codec/x264.c

Allow seeking in segments not downloaded yet. Since the exact file size
for future segments is unknown seeking will be inaccurate.

Start playback right after successfull downloading of the first segment. Switch to a higher bandwidth
later on. By the time peeking and first segment have been played the next segment is available.
(cherry picked from commit 82512718)

Conflicts:

	modules/stream_filter/httplive.c

If block_Realloc() fails in the function AccessDownload() then resolving
segment->data->i_buffer results in a segmentation error. Instead of continuing
when block_Realloc() has failed, just cleanup and leave the function.
(cherry picked from commit 3e8e9287ae7d138da73b3794de700f3c1efb22fb)

HTTP Live Streams are number from 0 in vlc_array_t. The condition in Download()
excluded 0 as valid stream. The first element in the array is at index 0, so consider
this to be valid.
(cherry picked from commit 7acbd2448c289cf28a80cfc0dd2ece21860aa6e9)

If block_Realloc() fails in the function AccessDownload() then resolving
segment->data->i_buffer results in a segmentation error. Instead of continuing
when block_Realloc() has failed, just cleanup and leave the function.

This reverts commit 0861691f.

This should not be possible, probably the backtraces were corrupted.

This is extra-precaution, but it cannot do harm

VLC doesn't use foreign M4 macros anymore

This reverts commit ae14df5a.

[d85d6537] explains why it is needed

This introduce a circular dependency. The correct way (which what Rafael is doing) is to explicitely set the dependencies in the .package to automake, libtool...

This fix unbreaks those who don't build autoconf.

Note, I have absolutely no idea why this is needed. This doesn't feel right anyhow.

It could happen when the demuxer was forced.

It was called 2 times.

Payload types are scoped to the RTP session, and we put each ES in its
own session, so no risk of conflict