Port bpftrace to work on ebpf for Windows

[rob-scheepens]

In bpftrace/bpftrace#1833 (comment), Brendan mentions BPF on Windows. Having bpftrace on Windows to be able to create simple BPF one-liners and programs would imo increase adoption.

[dahavey]

@rob-scheepens, what are the dependencies of bpftrace that are missing now? #734, #206

[rob-scheepens]

@dahavey , not entirely sure how to answer that question as I am far from an expert on (e)BPF). Perhaps the list on https://github.com/iovisor/bpftrace/blob/master/docs/reference_guide.md#contents can serve as a starting point to see what works today and what doesn't yet? I guess the clang and llvm dependencies are key to the effort?