switch to mimalloc when using musl#79
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Source: https://nickb.dev/blog/default-musl-allocator-considered-harmful-to-performance/
musl's memory allocator is crazy slow, in certain situations leading to slowdowns of up to 7x, especially when memory allocations happen often. Given that this is a web server, it's safe to assume this is the case.
Only include mimalloc when using musl, otherwise use the default allocator.