[Toybox] [PATCH] Support diff --no-dereference

[Daniel Rosenberg]

diff --no-dereference causes diff to not follow symlinks, instead comparing
the link name.

Added some basic tests.
---
 lib/lib.h           |  1 +
 lib/xwrap.c         |  5 +++
 tests/diff.test     |  7 ++++
 toys/pending/diff.c | 96 +++++++++++++++++++++++++++++++++++----------
 4 files changed, 88 insertions(+), 21 deletions(-)
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