Ensure the library search path from cc_toolchain is preferred over whatever rustc finds in the Windows registry #3608
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… is preferred over whatever rustc finds in the Windows registry.
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I don't see a good way to stop rustc from adding the non-hermetic library search path, so put our cc_toolchain library search path on the command line where it has precedence over the non-hermetic path injected by rustc.
See https://rust-lang.zulipchat.com/#narrow/channel/242869-t-compiler.2Fwindows/topic/rust.20LIB.20path for discussion of the rustc behavior.
Closes #3256.