[Toybox] Small build and warning fixes

[ibid.ag at gmail.com]

I ran into build errors with tftpd and dumpleases, so here's a fix:
POLL_IN is a POSIX macro in signal.h, so we need to use another label.
toynet.h was deleted before dumpleases was merged.
While I was at it, I thought I'd shut up the warnings in blkid by
explicitly naming the types of three numbers.

Thanks,
Isaac Dunham
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