The fact that this function was excluded on i386 seems to have been a mistake since the initial version where ucrtbase was added, in 599d92a26822244b9703734a6a8972a0009cdf09; many float math functions (with an -f) suffix is unavailable in ucrtbase.dll on i386, but powf does seem to have existed in all versions of the DLL that I can find.
Signed-off-by: Martin Storsjö martin@martin.st