[Toybox] [PATCH] Fix Mac build.

[enh]

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(-)
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