initial import of libpixman-0.1.0

initial import of libpixman-0.1.0

libpixman - Pixel manipulation library

libpixman is a merge of libpixregion and libic.
It also includes the slim headers.

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libpixregion - Pixel region Library

libpixregion is a generic library for manipulating pixel regions. A
PixRegion is a set of Y-X banded rectangles that cover the desired
region.

libic - Image compositing library

libic is a generic image compositing library. libic provides
Porter/Duff compositing of images and implicit mask generation for
geometric primitives including trapezoids, triangles, and rectangles.

slim - Shared Library Interface Macros