[U-Boot] bch: don't use __BSD_VISIBLE to test for fls

[Tom Rini]

On Sun, Aug 27, 2017 at 08:45:14PM +1000, Jonathan Gray wrote:

> Commit 4ecc988301bc8e981e6d7538c57cdb3aa82f7c1d assumes fls is in libc
> if __BSD_VISIBLE is defined.  This appears to only be true on FreeBSD
> and DragonFlyBSD.  OpenBSD defines __BSD_VISIBLE and does not have fls
> in strings.h/libc.
> 
> Switch the test for __BSD_VISIBLE to one for __DragonFly__ and
> __FreeBSD__ to unbreak the build on OpenBSD.
> 
> Signed-off-by: Jonathan Gray <jsg at jsg.id.au>

Applied to u-boot/master, thanks!

-- 
Tom
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