kbuild: rust: use `-Zdebuginfo-compression`

Rust 1.74.0 introduced (unstable) support for the
`-Zdebuginfo-compression` flag, thus use it.

Note that the releases built by the Rust project (i.e. the ones provided
by rustup) do not enable support for zstd in their bundled LLVM (yet,
at least), thus the Rust compiler will warn, but the build will proceed:

    warning: unknown debuginfo compression algorithm zstd - will fall
    back to uncompressed debuginfo

Link: https://github.com/rust-lang/rust/issues/120953
Link: https://github.com/rust-lang/rust/pull/115358
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Added note about zstd support in Rust-provided binaries. ]
Signed-off-by: Miguel Ojeda <[email protected]>

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