[PATCH, ARM] Don't pull in unwinder for 64-bit division routines

[Sebastian Huber]

Hello,

with this move to t-bpabi other targets like RTEMS profit also from this 
change.  This is very good since the unwinder pull-in for 64-bit divisions was 
pretty bad for small Cortex-M3 systems with internal flash only.

-- 
Sebastian Huber, embedded brains GmbH

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