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Some stupid linux header was deprecated.
Based on the work in urbit/urbit#4675 with some upgrades. The structured exception handling code in the original is crazy. It was originally done because libsigsegv installs a top level structured exception handler which means that every time we fault we end up unwinding a potentially very deep stack. We (and most likely libsigsegv too) can instead install a [vectored exception handler ](https://learn.microsoft.com/en-us/windows/win32/debug/vectored-exception-handling) that functions exactly as we want without unwinding the stack. We still have cross-compilation from any of our supported targets to any of our supported targets. Current known limitations: Demand paging does not work. The spin hint does not work. JSON tracing does not work. The jump buffer in the road struct needs to be 16 byte aligned on windows, we'll fix when merging @joemfb:s allocator work. There are some strange padding zeroes at the end of south.bin breaking checkpoint version negotiation, fix same as above.
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staging PR for accumulating and reviewing migrations, more to come.