[Toybox] [PATCH] Fix Mac build.

[Rob Landley]

On 3/10/20 11:20 AM, enh via Toybox wrote:
> The recent re-enablement of the BLKGETSIZE64 code broke the Mac
> build. Use the equivalent <sys/disk.h> ioctl() pair instead.
> ---
>  lib/lib.c         |  5 +----
>  lib/portability.c | 20 ++++++++++++++++++++
>  lib/portability.h |  2 ++
>  3 files changed, 23 insertions(+), 4 deletions(-)

I wonder if fdlength() should just move to portability.c at this point?
(Does the mac ever need the fallback binary search? It was a workaround for a
linux bug I hit which I'm not 100% sure is still relevant, but "regression test
with all the block devices out there" is hard to do so I've left it...)

Anyway, applied,

Rob