Log Message:
Changes 2.0.21:
* Add VC9 project files, source code formatting, fix compiler
  warnings, move VC8 project files, remove leftover autoconf/m4 files
* Move static transfer lookup array from .h to .c
  (patch contributed by Zbigniew Holdys)
* Add support for VC++ compiler/MASM assembly with active USE_MMX
  (contributed by Markus Hossner)
* Added Haiku build support in configure.in
  (contributed by Scott McCreary)
* Added helper function that multiplies the alpha channel in
  a 32bit surface (contributed by Zbigniew Holdys)
* Disable MMX for 64bit platforms due to lack of support for
  pusha/popa (contributed by Olivier Boudeville)
* Update all library functions for doxygen markup. Add doxygen
  configuration file.
* Added font rotation support and updated TestFonts sample
* Fixed rotate90 for 0 degree case
  (contributed by Chris Allport)
* Updated TestRotozoom with rotate90 case and message display
* Added support for SDL 1.3
* Added doxygen generated documentation.