Provide linuxArm32Hfp target

[sandwwraith]

Despite being deprecated, it has not been removed and is provided in stdlib and kotlinx-serialization. It also makes sense to support it in kotlinx-io until it is deleted completely.

[lppedd]

Is its deletion planned or still under consideration?

[sandwwraith]

I'm not aware of such plans, but it is not actively developed either.