rustbuild: Fix compiletest warning when building outside of root. #93399
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This fixes a warning that would happen when passing arguments to compiletest (like
x.py test src/test/ui
) when runningx.py
outside of the root source directory. For example, the CI builders do this, which causes a confusing warning message. This also fixes it so that passing a full path works (likex.py test src/test/ui/hello.rs
) in the same scenario (previously it would just ignore thehello.rs
part).