[Toybox] [PATCH] lib/portability.c: don't assume we have __NR_copy_file_range.

[enh]

Android's host tools currently build with glibc from 2012, but even if
we were more up to date (or had already switched to musl for host tools,
which hopefully will be the case by this time next year), it was added
to glibc recently enough to miss the "seven year window".
---
 lib/portability.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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