[Toybox] [PATCH] cat.test: fix tests for Mac.

[enh]

/proc/self/exe doesn't exist, but $C already gives us the path to
the binary. /dev/full doesn't have any equivalent afaik, so skip
that test if /dev/full is missing.

---
 tests/cat.test | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
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