Support for 32-bit archs?

Hi! I help maintain this in Debian and we build it for i386 and armhf, but got failures:

```
src/github.com/containerd/accelerated-container-image/pkg/snapshot/diskquota/prjquota.go:51:28: math.MaxUint32 (untyped int constant 4294967295) overflows int
```

Maybe the fix is simple? I'm not sure this package is all that relevant on 32-bit archs, but maybe it is...

Thanks,
Simon

Start at src/github.com/containerd/accelerated-container-image/pkg/snapshot/diskquota/prjquota.go:51 and reproduce the reported build failure for i386 and armhf. Check whether this package is expected to support those architectures, then verify that the chosen compatibility change allows both builds without affecting supported platforms.

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