Rollup merge of #130138 - Zalathar:initial-libdir, r=albertlarsan68

bootstrap: Print more debug info when `find_initial_libdir` fails

From looking at the failure messages printed by #129775, my hypothesis is that `rustc --print=sysroot` sometimes prints the wrong path when the rustc executable is hardlinked in multiple places, at least on my macOS system.

However, currently I don't have any concrete evidence of this actually happening. This PR therefore expands on #129775 by printing even more information on failure (including the actual rustc path), in the hope that when the failure next occurs we can confirm or reject the hypothesis that `rustc --print=sysroot` is printing the wrong path.

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