bde51232ba
Summary: This header is practically useless, but we provide it mostly for the macros so that applications can compile. I'm only doing this for the `libc++` unittests that want it, and it is part of the C standard technically. I just made an RPC call to do `raise`. Anything more isn't going to work since it'd be way too annoying to make the CPU call into some signal handler the GPU registered.