[PATCH] byteswap.h: fix gcc ver test for __builtin_bswap32

[Andreas Schwab]

Rich Felker <dalias@aerifal.cx> writes:

> Using __builtin_bswap32 is utterly useless. Ever since the early to
> mid 4.x series, GCC generates the proper optimized code for the naive
> direct expression of bswap32 in C.

You need to be a bit careful about the exact form, though, and
__builtin_bswap32 doesn't require duplicating the argument.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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