[math] sync with latest musl updates #935
Merged
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See
https://git.musl-libc.org/cgit/musl/commit/?id=688d3da0f1730daddbc954bbc2d27cc96ceee04c
https://git.musl-libc.org/cgit/musl/commit/?id=b023c03b574acdfd73418314a5dcaa83e5cea5a0
Before:
Mathf.exp(-NaN) == 0
With fixes:
Mathf.exp(-NaN) == -NaN