libsdl-ttf: update to 2.0.11

* Licence changed to Zlib [1]
* patch does not apply anymore and does not seem to miss

[1] https://www.libsdl.org/projects/SDL_ttf/



Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>