Fix Stat build on Android

[jrflat]

On Android on certain architectures, struct stat defines properties

unsigned long long st_dev;
unsigned long long st_ino;
unsigned int st_mode;

instead of

dev_t st_dev;
ino_t st_ino;
mode_t st_mode;

I think we should keep the dev_t, ino_t, and mode_t types as the backing for CInterop.DeviceID, CInterop.Inode, and CInterop.Mode, so this PR just performs a numericCast(_:) in the respective Stat getter and setters, which is compiled out in cases where the types match.

[jrflat]

@swift-ci please test

[finagolfin]

Thanks, this fixed my older unofficial CI too. ❤️