Fix for building against musl

[Mike Frysinger]

On 16 Mar 2015 21:42, Felix Janda wrote:
> <asm/ioctl.h> is for example needed for _IOC_SIZE(). That is
> likely also the reason why ioctl.c includes it.

we should stick to linux/ioctl.h imo, and update ioctl.c to match
-mike
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