Updated SDL 1.3 to rev. 4563, fixed compilation

alienblaster/project/sdl/sdl-1.3/include/SDL_endian.h

@@ -40,6 +40,10 @@
 /*@}*/
 
 #ifndef SDL_BYTEORDER           /* Not defined in SDL_config.h? */
+#ifdef __linux__
+#include <endian.h>
+#define SDL_BYTEORDER  __BYTE_ORDER
+#else /* __linux __ */
 #if defined(__hppa__) || \
     defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
     (defined(__MIPS__) && defined(__MISPEB__)) || \
@@ -49,6 +53,7 @@
 #else
 #define SDL_BYTEORDER	SDL_LIL_ENDIAN
 #endif
+#endif /* __linux __ */
 #endif /* !SDL_BYTEORDER */