[cairo] patch for cairo_traps_extract_region

[Vladimir Vukicevic]

Carl Worth wrote:
> I just saw a couple of very minor cosmetic issues:
> 
>  * Indentation should be 4 spaces not 2 in long-dashed-lines.c
> 
>  * The change to perf/Makefile.am adds trailing whitespace, (hopefully
>    you've got the default git pre-commit set as executable as it will
>    catch this for you).
> 
> So, fix those, and yes, please push.

Fixed and pushed.

    - Vlad