update libwhich to latest commit (from 2022/10)

[semarie]

it supports more platforms.

it is part of on-going work to port julia to OpenBSD.

[vtjnash]

I think you also need to first update Yggdrasil to build the latest commit also

[imciner2]

I don't think libwhich is in Yggdrasil.

[ViralBShah]

Should we add it to Yggdrasil?

[inkydragon]

Should we add it to Yggdrasil?

libwhich is a small tool that probably won't be used by anyone else in the julia ecosystem.
It's fine for me to add it or not.

julia/THIRDPARTY.md

Lines 49 to 53 in 61fc907

	Julia's build process uses the following external tools:
	- [PATCHELF](https://github.com/NixOS/patchelf/blob/master/COPYING) [GPL3]
	- [OBJCONV](https://www.agner.org/optimize/#objconv) [GPL3]
	- [LIBWHICH](https://github.com/vtjnash/libwhich/blob/master/LICENSE) [MIT]

julia/stdlib/Makefile

Line 12 in d12a620

# Note: Some deps do not have a `_jll` pkg: [libwhich, patchelf, utf8proc]

[imciner2]

I think it is a build-time only dep, right? If so, I don't really see a need to put it into Ygg.

[fingolfin]

This moves libwhich from a commit made in November 2017 to the most recent (from October 2022), including fixes for OpenBSD and musl (?), so it seems indeed long overdue to do this. Hopefully won't cause regressions, but if the tests pass, should be merged.

However the mingw32 test is failing. I hope it's a fluke but it should be restarted to verify.