fix compilation to ARMv6-M with +alloc #290
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fixes #285
explanation: there's no
Arctype in thealloccrate (or the standard library) when you compile for ARMv6-M because the type uses CAS operations (compare_and_swap) in its implementation and that API is not available on ARMv6-M. this PR fixes the issue by omitting theimpl Format for Arcwhen the target is ARMv6-Mactually there are more "no CAS" targets than ARMv6-M so this PR does the same for all those (that we know of as of rust 1.48)