Previously, we added these rpaths to lime.ndll when it was built in commits c70ec9f and 333d093, but it's actually necessary only for Neko, so now I made it happen specfically after calling `nekotools boot` to create the Neko executable.
I've tested cpp and hl, and I've confirmed that the executables still launch successfully when these rpaths are omitted. It's better for their security to use fewer rpaths.
As noted commit c70ec9f, adding these rpaths is necessary due to a change in Xcode 15 where /usr/local/lib used to be available on the rpath automatically, but now it isn't, which affects the executable's ability to find the libneko dylib.
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