text: GP_FontFaceFree(): Do not SegFault on NULL

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
spiv: Add support for TTF font

Adds two config options for TTF font path and font height.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
text: GP_Font.c: Remove useless includes.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
core: MixPixels: Change RGB mix to linear.

Do not use Gamma mixing, this fixes font rendering.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>