Backport SDL ttf

We use the same technique than in Backport FreeType.

apt-src install libsdl-ttf2.0-0
cd sdl-ttf2.0-2.0.9/
dch -i

changelog entry:

sdl-ttf2.0 (2.0.9-1~bpo40+1) etch-backports; urgency=low

  * Rebuild for Debian Backports <http://www.backports.org/>
    (new version fixes rendering bugs)

 -- Sylvain Beucler <beuc@beuc.net>  Tue, 11 Dec 2007 01:18:53 +0100

Warning: if you backport SDL_ttf you're almost certainly already have backported FreeType (since Etch's version makes SDL_ttf crash). However you need compile sdl-ttf2.0 _without_ your libfreetype6 backport installed. Otherwise shlibs will automatically detect it and add a dependency to "libfreetype6 (>= 2.3.5)" (instead of Etch's 2.2.1-5), and people won't be able to use your SDL_ttf backport alone.

Granted, using SDL_ttf alone may not be very useful in this particular case, but that's not the backports philosophy, and you never know what users really need.

When building a single package (i.e. without depending on other backported packages) it's easier to use pbuilder, cf. Backport_FreeType#Cleaner_compilation.

TODO: I think we now should include all the changelog entries between the stable version and the backported one in the .changes file. debuild option?