[cairo] Speeding up _cairo_fixed_from_double

[Bill Spitzak]

Michael Sweet wrote:

>     #ifdef __APPLE__
>     #  ifdef __i386__
>     #    define LITTLE_ENDIAN
>     #    undef BIG_ENDIAN
>     #  else
>     #    undef LITTLE_ENDIAN
>     #    define BIG_ENDIAN
>     #  endif /* __i386__ */
>     #endif /* __APPLE__ */

I just checked our code, and it appears OS/X compilers define 
__BIG_ENDIAN__. Our code appears to assumme that if that is defined it 
is big-endian, and does approximately this:

#if defined(__BIG_ENDIAN__) || defined(__sgi) || .. others here
# define BIG_ENDIAN 1
#else
# define BIG_ENDIAN 0
#endif