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f34cd3f7c1
This changes a bunch of things that allows building with the musl C lib, provided that `libucontext-dev` and `pkg-config` are installed. Note that installing libucontext makes absolutely zero sense on C libs that do natively provide this deprecated System V API, such as glibc. Hence, it no sane glibc setup is expected to ever have libucontext installed. A main pain point was that argv and argc are expected to be passed to init_fini handlers, but that is actually a glibc extension. This just parses `/proc/self/cmdline` by hand to populate argv and argc during startup, unless running on glibc.