[PATCH] Test-suite McCat signed char

[Renato Golin]

Creating a typedef for ARM, since the test assumes signed char.

Changing all chars to "signed char" would also work on x86, but I wanted to
make it explicit why we're using it (ifdef __arm__) rather than leaving it
to anyone's guess.

Thanks Tim for pointing the issue.

Can I commit?

cheers,
--renato
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