Removed outdated Atari support

include/SDL.h

@@ -38,8 +38,8 @@ and 2D framebuffer across multiple platforms.
 
 The current version supports Linux, Windows, Windows CE, BeOS, MacOS,
 Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX.
-The code contains support for Atari, AIX, OSF/Tru64, RISC OS, and
-SymbianOS, but these are not officially supported.
+The code contains support for AIX, OSF/Tru64, RISC OS, and SymbianOS,
+but these are not officially supported.
 
 SDL is written in C, but works with C++ natively, and has bindings to
 several other languages, including Ada, C#, Eiffel, Erlang, Euphoria,