Fix haxelib on OSX failing to find neko dlls

[Aidan63]

Trying to use a recent haxe nightly with setup-haxe results in libneko errors on OSX.

 /usr/bin/tar xz -C neko-2.3.0-osx64 -f /Users/runner/work/_temp/d41fcca9-6a05-40e9-968e-3aeac137eed5
/bin/ls -1 neko-2.3.0-osx64
neko-2.3.0-osx64
/usr/bin/tar xz -C haxe_latest -f /Users/runner/work/_temp/d00a9bdc-8d92-469c-8e25-93d463847701
/bin/ls -1 haxe_latest
haxe_20240612100642_2106be4
/bin/ln -sfv /Users/runner/hostedtoolcache/neko/2.3.0/x64/libneko.2.dylib /Users/runner/hostedtoolcache/haxe/latest/x64/libneko.2.dylib
/Users/runner/hostedtoolcache/haxe/latest/x64/libneko.2.dylib -> /Users/runner/hostedtoolcache/neko/2.3.0/x64/libneko.2.dylib
/Users/runner/hostedtoolcache/haxe/latest/x64/haxelib setup /Users/runner/hostedtoolcache/haxe/latest/x64/lib
dyld[3399]: Library not loaded: @rpath/libneko.2.dylib
  Referenced from: <7B493A09-7C35-3D4A-8AE7-A0A7B110E9EB> /Users/runner/hostedtoolcache/haxe/latest/x64/haxelib
  Reason: tried: '/usr/local/lib/libneko.2.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/lib/libneko.2.dylib' (no such file), '/usr/local/lib/libneko.2.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/lib/libneko.2.dylib' (no such file)

Which is apparently due to recent packaging changes.

I think this is due to HaxeFoundation/haxe#11653. Previously the haxelib binary had the same rpath as the neko binary, which included @loader_path. However, now the haxelib binary is built with its own rpath which does not include this. This is why it is failing to find libneko. I'm not sure if the binaries are intended to be installed the way that setup-haxe is doing it.

This can be fixed either by adding the rpath to the haxelib binary or by changing setup-haxe to install the binaries to a default loader path (/usr/local/lib) or to modify the binary with install_name_tool so it can locate libneko in the custom install path.

Making sure DYLD_FALLBACK_LIBRARY_PATH points to the extracted neko folder seems to do the trick. I've also downgraded the mac ci version to 13 since thats the last version of the mac runner to use x86, so we can see that this fix works.

[krdlab]

Thank you for your PR!

Three checks are failing, but these are problems with the test code, so I will merge this PR.

/Users/runner/hostedtoolcache/haxe/3.4.7/x64/lib/hxnodejs/12,2,0/src/js/node/Crypto.hx:39: characters 5-13 : Unexpected abstract

[Aidan63]

Thanks, yeah, I saw those failing tests as well. I thought about trying to fix them but I don't know anything about node and it seemed unrelated anyway.