s/gb_cavas_stroke_miter_set/gb_canvas_stroke_miter_set/

[ntd]

This is not a PR because I was just surfing your project to see what this was about.

In canvas.c and canvas.h you have cavas instead of canvas.

[waruqi]

Thank you, this is a typo, but I don't plan to fix it at the moment, because I don't maintain this project anymore. But I am currently rewriting the entire project internally, and I will fix these problems. Maybe I will update it again in half a year.

[ntd]

No problem. Feel free to close this issue if you wish.