Commit e1519dfed453130da3376f13162e9da3508f8515

brushlib: virtual destructor

Should not affect anything at the moment, just good C++ style.


13	13	// surface interface required by brush.hpp
14	14	class Surface {
15	15	public:
	16
	17	virtual ~Surface() {}
	18
16	19	virtual bool draw_dab (float x, float y,
17	20	float radius,
18	21	float color_r, float color_g, float color_b,