[Toybox] [PATCH] diff: fix diff of stdin for systems without /tmp.

[enh]

xtempfile() alreay does the right thing, so switch to that.

Also use xsendfile() for the actual copying.

Fixes the cat tests on Android.
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 toys/pending/diff.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)
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