[Toybox] [PATCH] chmod: support complex modes.

[enh]

Change 5109da9b3e6a898c8e0ad647303a1b375e3d97d3 caused test.test to call
chmod with mode `u+s+s` which passes on the host (where you have a
toybox test but a GNU chmod) but fails on Android where chmod is toybox
too.

Add the missing loop to string_to_mode(), which means this will also
affect other toys, but that seems like a feature (and, for example, GNU
mkdir also accepts a mode like `a=r+w+x`).
---
 lib/lib.c        | 76 +++++++++++++++++++++++++-----------------------
 tests/chmod.test |  1 +
 2 files changed, 41 insertions(+), 36 deletions(-)
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