core.sys.posix.sys.stat: Fix duplicate definition of __mode_t on Musl

[CyberShadow]

The definition was conflicting with the other definitions within the same file.

[dlang-bot]

Thanks for your pull request, @CyberShadow!

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Testing this PR locally

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dub run digger -- build "master + dmd#14793"

[ibuclaw]

I'd prefer to inverse the version condition.

[CyberShadow]

I think ideally we want to decide if this is a definition tied to the platform or libc, not this odd mix of both. So, I could remove the definitions from the platform blocks and add one to all the libc blocks, or the other way around.

[ibuclaw]

I think ideally we want to decide if this is a definition tied to the platform or libc, not this odd mix of both. So, I could remove the definitions from the platform blocks and add one to all the libc blocks, or the other way around.

I've already done a lot of this (dlang/druntime#3710) - so feel free to continue running with the baton if there's any more places didn't get in the first wave.

[CyberShadow]

OK, is this better?