[PATCH v2] erofs-utils: lib: rename `fallthrough` to `__erofs_fallthrough`

[Gao Xiang]

On 2025/8/27 14:22, Noboru Asai wrote:
> In order to fix compile errors with libxxhash,
> since `fallthrough` is used in xxhash.h.
> 
> Signed-off-by: Noboru Asai <asai at sijam.com>

Thanks, applied.

Although I also think libxxhash shouldn't export
such common name as a basic hash library, at least
it shouldn't confuse terminal applications using
these symbols.

Thanks,
Gao Xiang