Eliminate @loader_path/julia element of DL_LOAD_PATH (#42930)

Analogous to 236523f, we don't need to search in `@loader_path/julia` anymore, as `libjulia-internal` is now consistently within the same directory as our other dependencies.

(cherry picked from commit 486c8de)

Author: staticfloat

base/Base.jl

@@ -184,8 +184,6 @@ let os = ccall(:jl_get_UNAME, Any, ())
     if os === :Darwin || os === :Apple
         if Base.DARWIN_FRAMEWORK
             push!(DL_LOAD_PATH, "@loader_path/Frameworks")
-        else
-            push!(DL_LOAD_PATH, "@loader_path/julia")
         end
         push!(DL_LOAD_PATH, "@loader_path")
     end