Fix cacos (+Inf + finite*i) in round-downward mode (bug 16928)

[Andreas Jaeger]

On 05/09/2014 07:26 PM, Joseph S. Myers wrote:
> According to C99/C11 Annex G, cacos applied to a value with real part
> +Inf and finite imaginary part should produce a result with real part
> +0.  glibc wrongly produces a result with real part -0 in FE_DOWNWARD
> mode.  This patch fixes this by checking for zero results in the
> relevant case of non-finite arguments (where there should never be a
> result with -0 real part), and converts the tests of cacos to
> ALL_RM_TEST.

ok, thanks,
Andreas
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