Update config.{sub,guess} after extraction

libass is now hosted on github

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

Should close #8799

On OS X, fontconfig searches font only from /System/Library/Fonts, so this patch adds more search paths to its initialization.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

For consistency with 691e604c, libass doesn't need harfbuzz on Android. (It doesn't build anyway.)
Signed-off-by: Rafaël Carré <funman@videolan.org>

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

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

Cf CVE-2011-0226

'make fetch' has to fetch sources for all the built packages,
including dependency packages. Conversely, 'make fetch' should not
fetch sources of distro-provided packages, not even dependencies.
This should fix that.

As an minor bonus, 'make .foo' should now work even if foo is
provided by the distro, and conditional build rules should be cleaner.

And use autoreconf instead of autogen for tremor.