[libc][NFC] Use `#include <math.h>` in utils/FPUtil/ManipulationFunctions.h.

This reverts commit 352cba2441c6c4e00f067c9c68358cc0a6a5fffb.
"add back math.h #include utils/FPUtil/ManipulationFunctions.h".

Using `<math.h>` correct so downstream setup should be fixed.

GitOrigin-RevId: 2d9ae1d217890639518252ee1f39c9cc759749ef
1 file changed