This patch fixes two problems (#592)

This patch fixes the following two problems:

* On aarch32, cbrt(4) was returned instead of M_PI/2 when +-INFINITY is given to atanf.
* Due to a bug in gcc-13, sign of tanf(+-0) was wrong on PUREC_SCALAR and VXE.

This patch also adds testing for the first problem.
The second problem is detected by the existing tester.

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Co-authored-by: Naoki Shibata <shibatch.sf.net@gmail.com>