bootstrap: build compiler libs with version number of libs being built

Previously, on a non-stable channel, it's possible for two builds from
different versioned sources (e.g. 1.84.0 vs 1.84.1) to produce
`librustc_driver*.so` with the same filename hashes. This causes
problems with side-by-side installs wrt. linker search paths because
1.84.1 rustc bin and 1.84.0 may try to link to the "same"
`librustc_driver*.so` (same filename hash) but fail because the contents
of the so is actually different.

We try to mitigate this by including the version number of artifacts
being built via `__CARGO_DEFAULT_LIB_METADATA`.

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