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The `off_t` type, which is specified by the POSIX standard as a signed integer type representing file sizes, was defined as `long` or `int` depending on the target architecture without a clear explanation on why it was defined as such. While the POSIX standard does not specify the size requirement of the `off_t` type, it generally corresponds to the size of a pointer in practice, mainly because the optimal file handling size is closely tied to the native pointer size. For this reason, this commit removes the per-architecture `off_t` definition and defines it as `intptr_t` such that its size always matches the native pointer size. Note that the toolchain-defined `__INTPTR_TYPE__` macro is used instead of the `intptr_t` typedef as per the common convention used in the C standard library headers. Signed-off-by: Stephanos Ioannidis <root@stephanos.io>