[PATCH] math: Remove unused files

[Andreas Schwab]

On Sep 23 2025, Adhemerval Zanella wrote:

> The multiprecision slow paths were removed in glibc 2.28.

Ok.

There are also references to __mpatan and __mpatan2 in
sysdeps/x86_64/fpu/multiarch/e_atan*-fma*.c.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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