[PATCH] RTEMS: Unconditionally define _off_t to int64_t

[Sebastian Huber]

The background for this change is that the fsfseeko01 test fails on 
RISC-V without this change. Instead of adding yet another target to the 
list of standard targets, default _off_t to int64_t.

-- 
Sebastian Huber, embedded brains GmbH

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