libass: update to 0.13.0

[avih]

No description provided.

[tonytheodore]

Thanks!

[avih]

np.

FWIW, this version of libass doesn't require fontconfig anymore, except on windows XP. It can still be built with fontconfig, but by default it will only use it if it can't use DirectWrite at runtime (to enumerate the fonts).

With DirectWrite, the enumeration should be much much faster (with fontconfig it can sometimes take minutes the first time the application is executed) .

So when MXE decides to drop XP support, libass can drop fontconfig as a dependency.

[tonytheodore]

Noted, thanks.

[avih]

This version also drops ENCA support, so the --disable-enca can/should be removed as well (though it doesn't complain if it's there). I verified this locally.

I also just read the libass changelog and MXE's libass.mk, and as far as I can tell, beyond enca, there shouldn't be more stuff to do here.

Apologies for not having the XP comment and the ENCA thingy as part of the PR.