Revert "rustc: add note about libiconv dependency"

This reverts commit edfbbaf28258d968de64b364d4a0868a80cdf1c2.

I mistakingly believed that once 1.66.0 was used to bootstrap, we'd be
able to remove libiconv from rustc's build-time dependency tree on Darwin.
Sadly, this isn't the case, because src/tools/bootstrap depends on libc.

Additionally, it seems that my assessment in b1834a461edf7abf4a6fb89db0ed65904a48a01c
was wrong -- *any* dependency on `libc` will cause a requirement on
libiconv, due to rustc unconditionally linking every library specified
in `link` directives, no matter if the function is actually used.

This was worked around somewhat in https://github.com/rust-lang/libc/pull/2944
by not linking libiconv if libc is only a dependency of std, but this
doesn't apply when `libc` is a dependency of anything else.

Maybe one day we'll just rip out libiconv from `libc` entirely (or hide it
behind a feature flag), but for now, we can just keep it in `buildRustPackage`'s
`buildInputs` by default.

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