Log Message:
Update to 2.0.22:

Ver 2.0.22 - Sat Sep 11 23:26:42 EDT 2010
* Fixed line width calculation for normal and textured polygons
  (patch contributed by Daniel (SupSuper)
* Fixed version setup in configure.in
* Added rounded rectangle and rounded box primitives
* Updated test program for roundedbox + left/right-click support
* Fixed pie calculation (line-case detection, end-angle clipping)
* Updated DLL_EXPORT handling and added WIN64 test
  (patch contributed by tigerfishdaisy)
* Added thick line primitive based on Murphy's algorithm