libart_lgpl: Libart 2D graphics (libart.so) 2.3.21

Libart is a library for high-performance 2D graphics. It supports a very powerful imaging model, basically the same as SVG and the Java 2D API. It includes all PostScript imaging operations, and adds antialiasing and alpha-transparency. It is also highly tuned for incremental rendering. It contains data structures and algorithms suited to rapid, precise computation of Region of Interest, and a two-phase rendering pipeline optimized for interactive display.