Native Odin complex.h implementation

[thePHTest]

I have made a decent amount of progress with a native Odin implementation of complex.h .
So far I've been going off of the implementations in musl libc. Some are simple and marked with // FIXME .
e.g. cacos (https://git.musl-libc.org/cgit/musl/tree/src/complex/cacos.c) refers to https://dl.acm.org/doi/pdf/10.1145/275323.275324
I did find that FreeBSD has an implementation that matches closely to that paper that I could try to port eventually.
See https://github.com/freebsd/freebsd-src/blob/cf17c2ff11a9e027e92bebdb3eb3fec6727c9c03/lib/msun/src/catrig.c#L1

Other implementations in musl libc have the same or are very similar to the ones in OpenBSD and FreeBSD. They have their respective BSD 2 clause licenses copied over as well.
e.g. catan : https://git.musl-libc.org/cgit/musl/tree/src/complex/catan.c
is from https://github.com/openbsd/src/blob/master/lib/libm/src/s_catan.c
but there are slight differences as it looks like OpenBSD has some overflow handling? Should I just roll with the musl libc variation in these cases?

Let me know if this approach sounds good. For a first pull request some of the implementations might just be the simpler forms rather than the faster more complex versions.