https://github.com/JuliaCI/julia-buildkite & https://github.com/JuliaLang/julia

build: fix makefile rules and windows path separator used in build

Failed in 3h 13m
:linux: test x86_64-linux-gnubash .buildkite/utilities/test_julia.sh
Waited 2m 28s
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Ran in 1h 14m
:linux: test x86_64-linux-muslbash .buildkite/utilities/test_julia.sh
Waited 9m 21s
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Ran in 1h 32m
:linux: test aarch64-linux-gnubash .buildkite/utilities/test_julia.sh
Waited 4s
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Ran in 1h 44m
Total Job Run Time: 1d 3h