selected one with --sub-file

 - as a standalone file
 - as a kind of subtitle (even if it is a video track).
CD-G disk are not supported.

Please, report any file incorrectly decoded. (I have 0 sample with
circular scrolling)

In subtitle_Detect, do not add as a subtitle the file for which we
are doing the detection.
 (subtitle_Detect("file.sub") returned "file.sub")

Re-enables media library.
Fixes #1047 (nth attempt).

This means ICMP errors will be ignored, which is a Bad Idea.
But people are likely to complain about how it breaks their setup if we
don't ignore ICMP anyway.

These are not confidential, and fairly slow to compute.
(This is much simpler than caching them to disk, and more
 portable-app-friendly)

Patch by Hannes Domani.

from 0.16 to 0.16.1 before bootstrap (unlike the other builders it doesn't
bootstrap the contribs first)

to autopoint for win32