Update BoehmGC to 8.2 #307
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On windows, we have to disable thread local allocation as it does not work with the dll build of bdwgc. With version 8.2, it is possible to use the more finegrained `-Denable_thread_local_alloc` flag instead of `-Denable_parallel_mark` which also disables parallel marking.
Other compilers should support builtin atomics so don't require libatomic_ops with gc 8.2
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There will be a future release that solves the bug described in #303, so this prepares the way for that by updating to 8.2 for now.