(svn r26214) -Add: specialised animated SSE4 blitter (MJP)

With 32bpp base set about 15-20% faster in the Draw function (slower with 8bpp base set). Overall, with 32bpp base set, about 5% faster.

src/blitter/32bpp_anim.hpp

@@ -15,8 +15,8 @@
 #include "32bpp_optimized.hpp"
 
 /** The optimised 32 bpp blitter with palette animation. */
-class Blitter_32bppAnim FINAL : public Blitter_32bppOptimized {
-private:
+class Blitter_32bppAnim : public Blitter_32bppOptimized {
+protected:
 	uint16 *anim_buf;    ///< In this buffer we keep track of the 8bpp indexes so we can do palette animation
 	int anim_buf_width;  ///< The width of the animation buffer.
 	int anim_buf_height; ///< The height of the animation buffer.